Bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v4)

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

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

Author: dependabot[bot]

.github/workflows/sync-from-template.yaml

@@ -45,7 +45,7 @@ jobs:
     steps:
       # Clone the template repository
       - name: Check out template repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           repository: ${{ env.REPO_TEMPLATE }}
           token: ${{ github.token }}
@@ -59,7 +59,7 @@ jobs:
 
       # Clone the target repository. Check out a branch
       - name: Check out ${{ github.repository }}
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           repository: ${{ github.repository }}
           token: ${{ github.token }}