Bump actions/checkout from 5 to 6 in the updates group (#235)

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


Updates `actions/checkout` from 5 to 6
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: updates
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the codebase.
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python 3.
         uses: actions/setup-python@v6
@@ -45,7 +45,7 @@ jobs:
 
     steps:
       - name: Check out the codebase.
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Uninstall GitHub Actions' built-in Homebrew.
         run: tests/uninstall-homebrew.sh