rebase: bump google.golang.org/grpc from 1.55.0 to 1.56.0

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.55.0 to 1.56.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.55.0...v1.56.0)

---
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/server.go

@@ -895,7 +895,7 @@ func (s *Server) drainServerTransports(addr string) {
 	s.mu.Lock()
 	conns := s.conns[addr]
 	for st := range conns {
-		st.Drain()
+		st.Drain("")
 	}
 	s.mu.Unlock()
 }
@@ -1046,7 +1046,7 @@ func (s *Server) addConn(addr string, st transport.ServerTransport) bool {
 	if s.drain {
 		// Transport added after we drained our existing conns: drain it
 		// immediately.
-		st.Drain()
+		st.Drain("")
 	}
 
 	if s.conns[addr] == nil {
@@ -1856,7 +1856,7 @@ func (s *Server) GracefulStop() {
 	if !s.drain {
 		for _, conns := range s.conns {
 			for st := range conns {
-				st.Drain()
+				st.Drain("graceful_stop")
 			}
 		}
 		s.drain = true