Bump the gh-actions group across 1 directory with 2 updates

Bumps the gh-actions group with 2 updates in the / directory: [actions/checkout](https://github.com/actions/checkout) and [actions/setup-python](https://github.com/actions/setup-python).


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)

Updates `actions/setup-python` from 5 to 6
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: gh-actions
- dependency-name: actions/setup-python
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: gh-actions
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -23,11 +23,11 @@ jobs:
     steps:
      # Checkout the repo.
      - name: Checkout Python Fire repository
-       uses: actions/checkout@v4
+       uses: actions/checkout@v5
 
      # Set up Python environment.
      - name: Set up Python ${{ matrix.python-version }}
-       uses: actions/setup-python@v5
+       uses: actions/setup-python@v6
        with:
          python-version: ${{ matrix.python-version }}