rebase: bump google.golang.org/grpc from 1.72.2 to 1.73.0

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.72.2 to 1.73.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.72.2...v1.73.0)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-version: 1.73.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

vendor/google.golang.org/grpc/credentials/insecure/insecure.go

@@ -30,7 +30,7 @@ import (
 // NewCredentials returns a credentials which disables transport security.
 //
 // Note that using this credentials with per-RPC credentials which require
-// transport security is incompatible and will cause grpc.Dial() to fail.
+// transport security is incompatible and will cause RPCs to fail.
 func NewCredentials() credentials.TransportCredentials {
 	return insecureTC{}
 }
@@ -71,6 +71,12 @@ func (info) AuthType() string {
 	return "insecure"
 }
 
+// ValidateAuthority allows any value to be overridden for the :authority
+// header.
+func (info) ValidateAuthority(string) error {
+	return nil
+}
+
 // insecureBundle implements an insecure bundle.
 // An insecure bundle provides a thin wrapper around insecureTC to support
 // the credentials.Bundle interface.