Bump cachix/install-nix-action from v11 to v12
Bump cachix/install-nix-action from v11 to v12

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from v11 to v12.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](https://github.com/cachix/install-nix-action/compare/v11...07da2520eebede906fbeefa9dd0a2b635323909d)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
ento/elm-doc,ento/elm-doc