chore(3p/sources): Bump channels & overlays

Upstream nixpkgs removed a lot of aliases this time, so we needed to do
the following transformations. It's a real shame that aliases only
really become discoverable easily when they are removed.

* runCommandNoCC -> runCommand
* gmailieer -> lieer
  We also need to work around the fact that home-manager hasn't catched
  on to this rename.
* mysql -> mariadb
* pkgconfig -> pkg-config
  This also affects our Nix fork which needs to be bumped.
* prometheus_client -> prometheus-client
* rxvt_unicode -> rxvt-unicode-unwrapped
* nix-review -> nixpkgs-review
* oauth2_proxy -> oauth2-proxy

Additionally, some Go-related builders decided to drop support for
passing the sha256 hash in directly, so we need to use the generic hash
arguments.

Change-Id: I84aaa225ef18962937f8616a9ff064822f0d5dc3
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6792
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
Reviewed-by: flokli <flokli@flokli.de>
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: wpcarro <wpcarro@gmail.com>

ops/modules/tvl-buildkite.nix

@@ -13,7 +13,7 @@ let
 
   # All Buildkite hooks are actually besadii, but it's being invoked
   # with different names.
-  buildkiteHooks = pkgs.runCommandNoCC "buildkite-hooks" { } ''
+  buildkiteHooks = pkgs.runCommand "buildkite-hooks" { } ''
     mkdir -p $out/bin
     ln -s ${besadiiWithConfig "post-command"} $out/bin/post-command
   '';