Bump actions/setup-python from 2 to 3 (#126)

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>

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

.github/workflows/linting.yaml

@@ -12,7 +12,7 @@ jobs:
             - name: checkout
               uses: actions/checkout@v2
             - name: set up python
-              uses: actions/setup-python@v2
+              uses: actions/setup-python@v3
               with:
                   python-version: 3.8
             - name: Run pre-commit

.github/workflows/pythonpublish.yaml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v3
         name: Install Python
         with:
           python-version: 3.8
@@ -50,7 +50,7 @@ jobs:
     needs: build-artifacts
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v3
         name: Install Python
         with:
           python-version: 3.8