Use a nixos-unstable revision the channel has not yet advanced to (but
the tested jobset has succeeded already), so we'll benefit from the
polkit security update.
* //users/grfn/home/games: replace multimc with polymc.
Seems like this is the conclusion in in the trademark saga.
* //third_party/terrform-provider-glesys: use new mkProvider interface
See https://github.com/nixos/nixpkgs/commit/e7dbfd7ece0e
Change-Id: Ieb76a3d73c42ce1fa34050ac797fa4e3a905e8ef
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5075
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: grfn <grfn@gws.fyi>
