chore(ci): bump actions/setup-python from 3 to 4 (#703)

* chore(deps): bump actions/setup-python from 3 to 4

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 3 to 4.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v3...v4)

---
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>

* chore(ci): use latest 3.x python for tests

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Lucas Bickel <116588+hairmare@users.noreply.github.com>

.github/workflows/test.yaml

@@ -23,7 +23,9 @@ jobs:
         helm env
         helm plugin install https://github.com/quintush/helm-unittest
 
-    - uses: actions/setup-python@v3
+    - uses: actions/setup-python@v4
+      with:
+        python-version:  '3.x'
 
     - name: Setup environment for pre-commit
       run: hack/ci/github/setup/pre-commit.sh
@@ -55,9 +57,9 @@ jobs:
           helm env
           helm plugin install https://github.com/quintush/helm-unittest
 
-      - uses: actions/setup-python@v3
+      - uses: actions/setup-python@v4
         with:
-          python-version: 3.7
+          python-version: '3.x'
 
       - name: Install chart-testing
         uses: helm/chart-testing-action@v2.2.1