Bump actions/setup-python from 2.2.2 to 2.3.1

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 2.2.2 to 2.3.1.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](https://github.com/actions/setup-python/compare/v2.2.2...v2.3.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/lint.yaml

@@ -36,7 +36,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2.4.0
-      - uses: actions/setup-python@v2.2.2
+      - uses: actions/setup-python@v2.3.1
       - name: Install linter
         run: |
           python -m pip install --upgrade pip