Bump actions/setup-python from 2 to 3

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 2 to 3.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v2...v3)

---
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/tests.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python 3.8
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v3
       with:
         python-version: 3.8
     - name: Install dependencies
@@ -37,7 +37,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python 3.8
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v3
       with:
         python-version: 3.8
     - name: Upgrade pip 
@@ -165,7 +165,7 @@ jobs:
     #    CIBW_ARCHS_LINUX: ${{ matrix.arch }}
 
     # Setup Python environemtn for a pure wheel
-    - uses: actions/setup-python@v2
+    - uses: actions/setup-python@v3
       with:
         python-version: ${{ matrix.python-version }}
 
@@ -224,7 +224,7 @@ jobs:
 
     - name: Set up Python 3.8 to combine coverage Linux
       if: runner.os == 'Linux'
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v3
       with:
         python-version: 3.8