chore(deps): update cachix/install-nix-action action to v27

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
cachix/install-nix-action	action	major	v26 -> v27

---

Release Notes

cachix/install-nix-action (cachix/install-nix-action)

### [`v27`](https://redirect.github.com/cachix/install-nix-action/releases/tag/v27) [Compare Source](https://redirect.github.com/cachix/install-nix-action/compare/v26...v27) #### What's Changed - Enable `always-allow-substitutes` by default by [@​sandydoo](https://redirect.github.com/sandydoo) in [https://github.com/cachix/install-nix-action/pull/207](https://redirect.github.com/cachix/install-nix-action/pull/207) - nix: 2.20.5 -> 2.22.1 by [@​kashw2](https://redirect.github.com/kashw2) in [https://github.com/cachix/install-nix-action/pull/206](https://redirect.github.com/cachix/install-nix-action/pull/206) - ci: fix tests by [@​sandydoo](https://redirect.github.com/sandydoo) in [https://github.com/cachix/install-nix-action/pull/208](https://redirect.github.com/cachix/install-nix-action/pull/208) #### New Contributors - [@​kashw2](https://redirect.github.com/kashw2) made their first contribution in [https://github.com/cachix/install-nix-action/pull/206](https://redirect.github.com/cachix/install-nix-action/pull/206) **Full Changelog**: https://github.com/cachix/install-nix-action/compare/v26...V27

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.