rebase: bump google.golang.org/grpc from 1.71.1 to 1.72.0

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.71.1 to 1.72.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.71.1...v1.72.0)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-version: 1.72.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

@@ -259,6 +259,13 @@ var (
 	// SetBufferPoolingThresholdForTesting updates the buffer pooling threshold, for
 	// testing purposes.
 	SetBufferPoolingThresholdForTesting any // func(int)
+
+	// TimeAfterFunc is used to create timers. During tests the function is
+	// replaced to track allocated timers and fail the test if a timer isn't
+	// cancelled.
+	TimeAfterFunc = func(d time.Duration, f func()) Timer {
+		return time.AfterFunc(d, f)
+	}
 )
 
 // HealthChecker defines the signature of the client-side LB channel health
@@ -300,3 +307,9 @@ type EnforceSubConnEmbedding interface {
 type EnforceClientConnEmbedding interface {
 	enforceClientConnEmbedding()
 }
+
+// Timer is an interface to allow injecting different time.Timer implementations
+// during tests.
+type Timer interface {
+	Stop() bool
+}