`lib` comes from the Nixpkgs used to instantiate Home Manager itself and
cannot change within the module fixpoint. However, `pkgs` is configurable
(via `nixpkgs.*` or `_module.args`) and may come from a different Nixpkgs
instance from the one providing `lib`.
Mismatches between Home Manager's release and the release of the `pkgs`
instance are more common and also more likely to cause subtle issues.
This change extends the release check to include `pkgs.lib.trivial.release`
so that such mismatches can be detected and reported.
ab8e4b2b5a