rebase: Bump github.com/hashicorp/vault from 1.4.2 to 1.9.9

Bumps [github.com/hashicorp/vault](https://github.com/hashicorp/vault) from 1.4.2 to 1.9.9.
- [Release notes](https://github.com/hashicorp/vault/releases)
- [Changelog](https://github.com/hashicorp/vault/blob/main/CHANGELOG.md)
- [Commits](https://github.com/hashicorp/vault/compare/v1.4.2...v1.9.9)

---
updated-dependencies:
- dependency-name: github.com/hashicorp/vault
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/github.com/grpc-ecosystem/grpc-gateway/v2/runtime/mux.go

@@ -6,10 +6,13 @@ import (
 	"fmt"
 	"net/http"
 	"net/textproto"
+	"regexp"
 	"strings"
 
 	"github.com/grpc-ecosystem/grpc-gateway/v2/internal/httprule"
 	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/health/grpc_health_v1"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/proto"
@@ -23,15 +26,15 @@ const (
 	// path string before doing any routing.
 	UnescapingModeLegacy UnescapingMode = iota
 
-	// EscapingTypeExceptReserved unescapes all path parameters except RFC 6570
+	// UnescapingModeAllExceptReserved unescapes all path parameters except RFC 6570
 	// reserved characters.
 	UnescapingModeAllExceptReserved
 
-	// EscapingTypeExceptSlash unescapes URL path parameters except path
-	// seperators, which will be left as "%2F".
+	// UnescapingModeAllExceptSlash unescapes URL path parameters except path
+	// separators, which will be left as "%2F".
 	UnescapingModeAllExceptSlash
 
-	// URL path parameters will be fully decoded.
+	// UnescapingModeAllCharacters unescapes all URL path parameters.
 	UnescapingModeAllCharacters
 
 	// UnescapingModeDefault is the default escaping type.
@@ -40,6 +43,10 @@ const (
 	UnescapingModeDefault = UnescapingModeLegacy
 )
 
+var (
+	encodedPathSplitter = regexp.MustCompile("(/|%2F)")
+)
+
 // A HandlerFunc handles a specific pair of path pattern and HTTP method.
 type HandlerFunc func(w http.ResponseWriter, r *http.Request, pathParams map[string]string)
 
@@ -113,11 +120,30 @@ func DefaultHeaderMatcher(key string) (string, bool) {
 // This matcher will be called with each header in http.Request. If matcher returns true, that header will be
 // passed to gRPC context. To transform the header before passing to gRPC context, matcher should return modified header.
 func WithIncomingHeaderMatcher(fn HeaderMatcherFunc) ServeMuxOption {
+	for _, header := range fn.matchedMalformedHeaders() {
+		grpclog.Warningf("The configured forwarding filter would allow %q to be sent to the gRPC server, which will likely cause errors. See https://github.com/grpc/grpc-go/pull/4803#issuecomment-986093310 for more information.", header)
+	}
+
 	return func(mux *ServeMux) {
 		mux.incomingHeaderMatcher = fn
 	}
 }
 
+// matchedMalformedHeaders returns the malformed headers that would be forwarded to gRPC server.
+func (fn HeaderMatcherFunc) matchedMalformedHeaders() []string {
+	if fn == nil {
+		return nil
+	}
+	headers := make([]string, 0)
+	for header := range malformedHTTPHeaders {
+		out, accept := fn(header)
+		if accept && isMalformedHTTPHeader(out) {
+			headers = append(headers, out)
+		}
+	}
+	return headers
+}
+
 // WithOutgoingHeaderMatcher returns a ServeMuxOption representing a headerMatcher for outgoing response from gateway.
 //
 // This matcher will be called with each header in response header metadata. If matcher returns true, that header will be
@@ -179,6 +205,57 @@ func WithDisablePathLengthFallback() ServeMuxOption {
 	}
 }
 
+// WithHealthEndpointAt returns a ServeMuxOption that will add an endpoint to the created ServeMux at the path specified by endpointPath.
+// When called the handler will forward the request to the upstream grpc service health check (defined in the
+// gRPC Health Checking Protocol).
+//
+// See here https://grpc-ecosystem.github.io/grpc-gateway/docs/operations/health_check/ for more information on how
+// to setup the protocol in the grpc server.
+//
+// If you define a service as query parameter, this will also be forwarded as service in the HealthCheckRequest.
+func WithHealthEndpointAt(healthCheckClient grpc_health_v1.HealthClient, endpointPath string) ServeMuxOption {
+	return func(s *ServeMux) {
+		// error can be ignored since pattern is definitely valid
+		_ = s.HandlePath(
+			http.MethodGet, endpointPath, func(w http.ResponseWriter, r *http.Request, _ map[string]string,
+			) {
+				_, outboundMarshaler := MarshalerForRequest(s, r)
+
+				resp, err := healthCheckClient.Check(r.Context(), &grpc_health_v1.HealthCheckRequest{
+					Service: r.URL.Query().Get("service"),
+				})
+				if err != nil {
+					s.errorHandler(r.Context(), s, outboundMarshaler, w, r, err)
+					return
+				}
+
+				w.Header().Set("Content-Type", "application/json")
+
+				if resp.GetStatus() != grpc_health_v1.HealthCheckResponse_SERVING {
+					var err error
+					switch resp.GetStatus() {
+					case grpc_health_v1.HealthCheckResponse_NOT_SERVING, grpc_health_v1.HealthCheckResponse_UNKNOWN:
+						err = status.Error(codes.Unavailable, resp.String())
+					case grpc_health_v1.HealthCheckResponse_SERVICE_UNKNOWN:
+						err = status.Error(codes.NotFound, resp.String())
+					}
+
+					s.errorHandler(r.Context(), s, outboundMarshaler, w, r, err)
+					return
+				}
+
+				_ = outboundMarshaler.NewEncoder(w).Encode(resp)
+			})
+	}
+}
+
+// WithHealthzEndpoint returns a ServeMuxOption that will add a /healthz endpoint to the created ServeMux.
+//
+// See WithHealthEndpointAt for the general implementation.
+func WithHealthzEndpoint(healthCheckClient grpc_health_v1.HealthClient) ServeMuxOption {
+	return WithHealthEndpointAt(healthCheckClient, "/healthz")
+}
+
 // NewServeMux returns a new ServeMux whose internal mapping is empty.
 func NewServeMux(opts ...ServeMuxOption) *ServeMux {
 	serveMux := &ServeMux{
@@ -229,7 +306,7 @@ func (s *ServeMux) HandlePath(meth string, pathPattern string, h HandlerFunc) er
 	return nil
 }
 
-// ServeHTTP dispatches the request to the first handler whose pattern matches to r.Method and r.Path.
+// ServeHTTP dispatches the request to the first handler whose pattern matches to r.Method and r.URL.Path.
 func (s *ServeMux) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
 
@@ -245,7 +322,16 @@ func (s *ServeMux) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		path = r.URL.RawPath
 	}
 
-	components := strings.Split(path[1:], "/")
+	var components []string
+	// since in UnescapeModeLegacy, the URL will already have been fully unescaped, if we also split on "%2F"
+	// in this escaping mode we would be double unescaping but in UnescapingModeAllCharacters, we still do as the
+	// path is the RawPath (i.e. unescaped). That does mean that the behavior of this function will change its default
+	// behavior when the UnescapingModeDefault gets changed from UnescapingModeLegacy to UnescapingModeAllExceptReserved
+	if s.unescapingMode == UnescapingModeAllCharacters {
+		components = encodedPathSplitter.Split(path[1:], -1)
+	} else {
+		components = strings.Split(path[1:], "/")
+	}
 
 	if override := r.Header.Get("X-HTTP-Method-Override"); override != "" && s.isPathLengthFallback(r) {
 		r.Method = strings.ToUpper(override)