Bumps [cachix/cachix-action](https://github.com/cachix/cachix-action) from 14 to 15.
- [Release notes](https://github.com/cachix/cachix-action/releases)
- [Commits](
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.. | ||
backport.yml | ||
basic-eval.yml | ||
check-by-name.yml | ||
check-cherry-picks.yml | ||
check-maintainers-sorted.yaml | ||
check-nix-format.yml | ||
editorconfig.yml | ||
labels.yml | ||
manual-nixos.yml | ||
manual-nixpkgs.yml | ||
nix-parse.yml | ||
no-channel.yml | ||
ofborg-pending.yml | ||
periodic-merge-6h.yml | ||
periodic-merge-24h.yml | ||
update-terraform-providers.yml |