Bump actions/checkout from 3 to 4 (#376)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/netlify.yml

@@ -7,7 +7,7 @@ jobs:
   netlify:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: "deploy to netlify"
       uses: netlify/actions/cli@375963b92b795c7b979927c580dd6f2a65ebcf28
       with:

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
         os: [ubuntu-20.04, macos-11]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: cachix/install-nix-action@v23
       with:
         nix_path: 'nixpkgs=./nix'