chore(deps): bump actions/checkout from 4 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/unit.yml

@@ -24,7 +24,7 @@ jobs:
           client-id: ${{ secrets.SKILLS_SYNC_APP_CLIENT_ID }}
           private-key: ${{ secrets.SKILLS_SYNC_APP_PRIVATE_KEY }}
           owner: ${{ github.repository_owner }}
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           submodules: false
       - name: Init testkit submodule (App token, recursive)