chore(deps): bump actions/setup-python from 3.1.2 to 4 (#311)

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 3.1.2 to 4.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@98f2ad0...d09bd5e)

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

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

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

.github/workflows/tests.yml

@@ -29,7 +29,7 @@ jobs:
           go-version: ${{ matrix.go-version }}
 
       - name: Setup - Python
-        uses: actions/setup-python@98f2ad02fd48d057ee3b4d4f66525b231c3e52b6
+        uses: actions/setup-python@d09bd5e6005b175076f227b13d9730d56e9dcfcb
         with:
           python-version: 3.6
           cache: "pip"