Bump actions/setup-python from v1 to v2.2.2 (#46)

Bumps [actions/setup-python](https://github.com/actions/setup-python) from v1 to v2.2.2.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v1...dc73133)

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

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

.github/workflows/tests.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v2.2.2
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies