Bump actions/checkout from 4 to 6 (#253)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  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>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
   Lint:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Run ansible-lint
         uses: ansible/ansible-lint@main
   Tests:
@@ -29,7 +29,7 @@ jobs:
           - pdns-os-repos
     steps:
       - name: checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Install python
         uses: actions/setup-python@v5
         with: