Bump actions/setup-python from 2.3.1 to 3 (#23)

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 2.3.1 to 3.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v2.3.1...v3)

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

Signed-off-by: dependabot[bot] <[email protected]>

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

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
           submodules: recursive
 
       - name: Set up Python ${{ env.PYTHON_VERSION }}
-        uses: actions/setup-python@v2.3.1
+        uses: actions/setup-python@v3
         with:
           python-version: ${{ env.PYTHON_VERSION }}
 
@@ -43,7 +43,7 @@ jobs:
           submodules: recursive
 
       - name: Set up Python ${{ env.PYTHON_VERSION }}
-        uses: actions/setup-python@v2.3.1
+        uses: actions/setup-python@v3
         with:
           python-version: ${{ env.PYTHON_VERSION }}
 
@@ -75,7 +75,7 @@ jobs:
           fetch-depth: 0
 
       - name: Set up Python ${{ env.PYTHON_VERSION }}
-        uses: actions/setup-python@v2.3.1
+        uses: actions/setup-python@v3
         with:
           python-version: ${{ env.PYTHON_VERSION }}