gmock: 1.8.0 -> 1.8.1 (#46273)

Semi-automatic update generated by
https://github.com/ryantm/nixpkgs-update tools. This update was made
based on information from
gtest

pkgs/development/libraries/gtest/default.nix

@@ -1,13 +1,13 @@
 { stdenv, cmake, fetchFromGitHub }:
 stdenv.mkDerivation rec {
   name = "gtest-${version}";
-  version = "1.8.0";
+  version = "1.8.1";
 
   src = fetchFromGitHub {
     owner = "google";
     repo = "googletest";
     rev = "release-${version}";
-    sha256 = "0bjlljmbf8glnd9qjabx73w6pd7ibv43yiyngqvmvgxsabzr8399";
+    sha256 = "0270msj6n7mggh4xqqjp54kswbl7mkcc8px1p5dqdpmw5ngh9fzk";
   };
 
   buildInputs = [ cmake ];