gitlab: 13.5.1 -> 13.6.0

Changed ruby version to 2.7.x to match upstream.
Added a gem config for gitlab-pg_query as it tries to download a source
tarball during the build process.
Also removed a patch for gitaly that has become obsolete by upstream fix
[here](https://gitlab.com/gitlab-org/gitaly/-/commit/de04077c25cc23b001317d2efdf5a9ead0bc86b9).

pkgs/applications/version-management/gitlab/gitlab-workhorse/default.nix

@@ -3,13 +3,13 @@
 buildGoPackage rec {
   pname = "gitlab-workhorse";
 
-  version = "8.51.0";
+  version = "8.54.0";
 
   src = fetchFromGitLab {
     owner = "gitlab-org";
     repo = "gitlab-workhorse";
     rev = "v${version}";
-    sha256 = "012xbnd4lqfv478bbd2r9jhnb2f162gsa5y77z3by0kqqpsglgl5";
+    sha256 = "0fz00sl9q4d3vbslh7y9nsnhjshgfg0x7mv7b7a9sc3mxmabp7gz";
   };
 
   goPackagePath = "gitlab.com/gitlab-org/gitlab-workhorse";

pkgs/applications/version-management/gitlab/gitlab-workhorse/deps.nix

@@ -347,8 +347,8 @@
     fetch = {
       type = "git";
       url = "https://github.com/certifi/gocertifi";
-      rev = "ee1a9a0726d2";
-      sha256 = "08l6lqaw83pva6fa0aafmhmy1mhb145av21772zfh3ij809a37i4";
+      rev = "2c3bb06c6054";
+      sha256 = "00g5jy613nkm96k6ylbcwdwpdhm84mvw2gqr3gmj5mhwmsc8x97p";
     };
   }
   {
@@ -671,8 +671,8 @@
     fetch = {
       type = "git";
       url = "https://github.com/getsentry/raven-go";
-      rev = "v0.1.2";
-      sha256 = "1dl80kar4lzdcfl3w6jssi1ld6bv0rmx6sp6bz6rzysfr9ilm02z";
+      rev = "v0.2.0";
+      sha256 = "0imfwmsb72168fqandf2lxhzhngf2flxhzaar8hcnnfjv2a291lf";
     };
   }
   {