protobuf3_11: 3.11.3 -> 3.11.4

Changelog: https://github.com/protocolbuffers/protobuf/releases/tag/v3.11.4

pkgs/development/libraries/protobuf/3.11.nix

···
 { callPackage, ... }:
 
 callPackage ./generic-v3.nix {
-  version = "3.11.3";
-  sha256 = "0cn6h6fg5h64q5h3ncfwr3m7yszf5n9gpvgpv7s1csndp0ffzmin";
+  version = "3.11.4";
+  sha256 = "00g61f1yd8z5l0z0svmr3hms38ph35lcx2y7hivw6fahslw0l8yw";
 }