Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

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

.github/workflows/python-test.yaml

@@ -25,7 +25,7 @@ jobs:
  # needed because the postgres container does not provide a healthcheck
  options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
  steps:
- - uses: actions/checkout@v3
+ - uses: actions/checkout@v4
  - name: Setup python
  uses: actions/setup-python@v2
  with: