build(deps): 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] <[email protected]>

.github/workflows/check.yml

@@ -21,7 +21,7 @@ jobs:
     container: registry.fedoraproject.org/fedora:latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Install dependencies
         run: dnf install -y cargo git-core python3-pyyaml
       - name: Check for unreferenced templates

.github/workflows/sync.yml

@@ -20,7 +20,7 @@ jobs:
       matrix: ${{ steps.get.outputs.matrix }}
     steps:
       - name: Check out repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Install dependencies
         run: dnf install -y cargo
       - name: Cache build artifacts
@@ -66,7 +66,7 @@ jobs:
       - name: Install dependencies
         run: dnf install -y git-core
       - name: Check out target repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: ${{ matrix.repo }}
           path: dest