Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/lint.yaml

@@ -13,7 +13,7 @@ jobs:
       - name: "Checkout"
         uses: "actions/checkout@v4"
       - name: "Install Nix"
-        uses: "cachix/install-nix-action@v23"
+        uses: "cachix/install-nix-action@v22"
         with: { "extra_nix_config": "access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}" }
       - name: "Run Shellcheck"
         run: "nix develop --command bash -c \"find . -type f -name '*.sh' | xargs shellcheck\""
@@ -24,7 +24,7 @@ jobs:
       - name: "Checkout"
         uses: "actions/checkout@v4"
       - name: "Install Nix"
-        uses: "cachix/install-nix-action@v23"
+        uses: "cachix/install-nix-action@v22"
         with: { "extra_nix_config": "access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}" }
       - name: "Run Alejandra"
         run: "nix develop --command alejandra --check ."
@@ -35,7 +35,7 @@ jobs:
       - name: "Checkout"
         uses: "actions/checkout@v4"
       - name: "Install Nix"
-        uses: "cachix/install-nix-action@v23"
+        uses: "cachix/install-nix-action@v22"
         with: { "extra_nix_config": "access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}" }
       - name: "Check flake"
         run: "nix flake check --all-systems"