ci(deps): bump cachix/install-nix-action

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


Updates `cachix/install-nix-action` from 31.11.1 to 31.11.2
- [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/13d8dd58da0234aa297dedd986986ccb8e7f3e24...448cde739abec1eaf0646249e3d25bb8d9bc7702)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-version: 31.11.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

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

.github/workflows/nix.yml

@@ -23,6 +23,6 @@ jobs:
     timeout-minutes: 15
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-      - uses: cachix/install-nix-action@13d8dd58da0234aa297dedd986986ccb8e7f3e24 # v31.11.1
+      - uses: cachix/install-nix-action@448cde739abec1eaf0646249e3d25bb8d9bc7702 # v31.11.2
       - name: nix flake check --no-build
         run: nix flake check --no-build --all-systems