build(deps): Bump actions/setup-python from 2 to 3.1.0

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 2 to 3.1.0.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v2...v3.1.0)

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

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

.github/workflows/docs.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v3
       - run: pip install '.[docs]'
       - run: git config user.name 'github-actions[bot]' && git config user.email 'github-actions[bot]@users.noreply.github.com'
       - name: Publish docs

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
       uses: actions/checkout@v2
 
     - name: Set up Python 3.7
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v3
       with:
         python-version: '3.7'
 

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
       uses: actions/checkout@v2
 
     - name: Set up Python ${{ matrix.pyv }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v3
       with:
         python-version: ${{ matrix.pyv }}