meta: bump cachix/install-nix-action from 31.8.4 to 31.9.0

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 31.8.4 to 31.9.0.
- [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@0b0e072...4e002c8)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-version: 31.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/linters.yml

@@ -149,7 +149,7 @@ jobs:
           persist-credentials: false
           sparse-checkout: '*.nix'
           sparse-checkout-cone-mode: false
-      - uses: cachix/install-nix-action@0b0e072294b088b73964f1d72dfdac0951439dbd  # v31.8.4
+      - uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15  # v31.9.0
       - name: Lint Nix files
         run: |
           nix-shell -I nixpkgs=./tools/nix/pkgs.nix -p 'nixfmt-tree' --run '

.github/workflows/test-shared.yml

@@ -157,7 +157,7 @@ jobs:
           tar xzf tarballs/*.tar.gz -C "$RUNNER_TEMP"
           echo "TAR_DIR=$RUNNER_TEMP/$(basename tarballs/*.tar.gz .tar.gz)" >> "$GITHUB_ENV"
 
-      - uses: cachix/install-nix-action@0b0e072294b088b73964f1d72dfdac0951439dbd  # v31.8.4
+      - uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15  # v31.9.0
         with:
           extra_nix_config: sandbox = true
 

.github/workflows/tools.yml

@@ -306,7 +306,7 @@ jobs:
           allow-prereleases: true
       - name: Set up Nix
         if: matrix.id == 'nixpkgs-unstable' && (github.event_name == 'schedule' || inputs.id == 'all' || inputs.id == matrix.id)
-        uses: cachix/install-nix-action@0b0e072294b088b73964f1d72dfdac0951439dbd  # v31.8.4
+        uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15  # v31.9.0
       - run: ${{ matrix.run }}
         if: github.event_name == 'schedule' || inputs.id == 'all' || inputs.id == matrix.id
         env: