TUN-8052: Update go to 1.21.5

Also update golang.org/x/net and google.golang.org/grpc to fix vulnerabilities,
although cloudflared is using them in a way that is not exposed to those risks

vendor/google.golang.org/protobuf/internal/impl/convert.go

@@ -59,7 +59,6 @@ func NewConverter(t reflect.Type, fd protoreflect.FieldDescriptor) Converter {
 	default:
 		return newSingularConverter(t, fd)
 	}
-	panic(fmt.Sprintf("invalid Go type %v for field %v", t, fd.FullName()))
 }
 
 var (