Bump actions/checkout from 4 to 5 in the updates group (#225)

Bumps the updates group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `actions/checkout` from 4 to 5
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: updates
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the codebase.
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Python 3.
         uses: actions/setup-python@v5
@@ -41,7 +41,7 @@ jobs:
 
     steps:
       - name: Check out the codebase.
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Uninstall GitHub Actions' built-in Homebrew.
         run: tests/uninstall-homebrew.sh