rebase: bump google.golang.org/grpc from 1.68.1 to 1.69.0

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.68.1 to 1.69.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.68.1...v1.69.0)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

vendor/google.golang.org/grpc/dialoptions.go

@@ -87,7 +87,6 @@ type dialOptions struct {
 	disableServiceConfig        bool
 	disableRetry                bool
 	disableHealthCheck          bool
-	healthCheckFunc             internal.HealthChecker
 	minConnectTimeout           func() time.Duration
 	defaultServiceConfig        *ServiceConfig // defaultServiceConfig is parsed from defaultServiceConfigRawJSON.
 	defaultServiceConfigRawJSON *string
@@ -445,10 +444,6 @@ func WithContextDialer(f func(context.Context, string) (net.Conn, error)) DialOp
 	})
 }
 
-func init() {
-	internal.WithHealthCheckFunc = withHealthCheckFunc
-}
-
 // WithDialer returns a DialOption that specifies a function to use for dialing
 // network addresses. If FailOnNonTempDialError() is set to true, and an error
 // is returned by f, gRPC checks the error's Temporary() method to decide if it
@@ -662,16 +657,6 @@ func WithDisableHealthCheck() DialOption {
 	})
 }
 
-// withHealthCheckFunc replaces the default health check function with the
-// provided one. It makes tests easier to change the health check function.
-//
-// For testing purpose only.
-func withHealthCheckFunc(f internal.HealthChecker) DialOption {
-	return newFuncDialOption(func(o *dialOptions) {
-		o.healthCheckFunc = f
-	})
-}
-
 func defaultDialOptions() dialOptions {
 	return dialOptions{
 		copts: transport.ConnectOptions{
@@ -682,7 +667,6 @@ func defaultDialOptions() dialOptions {
 			BufferPool:      mem.DefaultBufferPool(),
 		},
 		bs:              internalbackoff.DefaultExponential,
-		healthCheckFunc: internal.HealthCheckFunc,
 		idleTimeout:     30 * time.Minute,
 		defaultScheme:   "dns",
 		maxCallAttempts: defaultMaxCallAttempts,