Bump actions/setup-python from 6 to 7 (#194)

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 6 to 7.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v6...v7)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/cpplint.yml

@@ -5,6 +5,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v6
-    - uses: actions/setup-python@v6
+    - uses: actions/setup-python@v7
     - run: pip install cpplint
     - run: cpplint --quiet --root=../ --filter=-build/c++11,-build/include,-runtime/array,-runtime/string,-whitespace/braces,-whitespace/indent,-whitespace/line_length,-whitespace/tab --recursive src tests