Bump actions/setup-python from 2.3.1 to 3.1.1 (#479)

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 2.3.1 to 3.1.1.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](https://github.com/actions/setup-python/compare/v2.3.1...v3.1.1)

---
updated-dependencies:
- dependency-name: actions/setup-python
  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>

.github/workflows/pythonpackage.yml

@@ -22,7 +22,7 @@ jobs:
       with:
         submodules: 'recursive'
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2.3.1
+      uses: actions/setup-python@v3.1.1
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies