fix(deps): update module github.com/golang/protobuf to v1.5.4

Author: renovate[bot]

gmtls/gmcredentials/go.mod

@@ -3,7 +3,7 @@ module github.com/tjfoc/gmsm/gmtls/gmcredentials
 go 1.15
 
 require (
-	github.com/golang/protobuf v1.5.2
+	github.com/golang/protobuf v1.5.4
 	github.com/tjfoc/gmsm v0.0.0-00010101000000-000000000000
 	golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd
 	google.golang.org/grpc v1.44.0