github-actions(deps): bump actions/checkout from 2.3.5 to 3.3.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.3.5 to 3.3.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.3.5...v3.3.0)

---
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/main.yml

@@ -6,7 +6,7 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.5
+    - uses: actions/checkout@v3.3.0
 
     - name: Shutdown default MySQL in Ubuntu (SUDO)
       run: sudo service mysql stop
@@ -61,7 +61,7 @@ jobs:
     needs: tests
     if: ${{ github.ref_name == 'main' }}
     steps:
-    - uses: actions/checkout@v2.3.5
+    - uses: actions/checkout@v3.3.0
 
     - uses: pixta-dev/repository-mirroring-action@v1
       with: