chore(deps): bump cachix/install-nix-action in the actions group

Bumps the actions group with 1 update: [cachix/install-nix-action](https://github.com/cachix/install-nix-action).


Updates `cachix/install-nix-action` from 31.9.0 to 31.9.1
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Changelog](https://github.com/cachix/install-nix-action/blob/master/RELEASE.md)
- [Commits](cachix/install-nix-action@4e002c8...2126ae7)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-version: 31.9.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/nix-flake.yaml

@@ -27,7 +27,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Install Nix
-        uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
+        uses: cachix/install-nix-action@19effe9fe722874e6d46dd7182e4b8b7a43c4a99 # v31.10.0
         with:
           github_access_token: ${{ github.token }}