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] <support@github.com>

.github/workflows/publish-pypi.yml

@@ -20,7 +20,7 @@ jobs:
         uses: step-security/harden-runner@a4aa98b93cab29d9b1101a6143fb8bce00e2eac4 # v2.7.1
         with:
           egress-policy: audit
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python3
         uses: actions/setup-python@v4
         with:

.github/workflows/tag-testpypi.yml

@@ -20,7 +20,7 @@ jobs:
         uses: step-security/harden-runner@a4aa98b93cab29d9b1101a6143fb8bce00e2eac4 # v2.7.1
         with:
           egress-policy: audit
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python3
         uses: actions/setup-python@v4
         with: