chore(deps): bump cachix/install-nix-action from 31.9.1 to 31.10.1

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 31.9.1 to 31.10.1.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Changelog](https://github.com/cachix/install-nix-action/blob/master/RELEASE.md)
- [Commits](https://github.com/cachix/install-nix-action/compare/v31.9.1...v31.10.1)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
dependency-version: 31.10.1
dependency-type: direct:production
update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[e-mail]>

.github/workflows/docs.yml

···
         uses: actions/checkout@v6
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v31.9.1
+        uses: cachix/install-nix-action@v31.10.1
 
       - name: Build Linux packages
         run: "nix build -L ./docs#tgirlpkgs-docs"