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](https://github.com/actions/checkout/compare/v3...v4)

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

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

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
           test-bot: false
 
       - name: Check out Pull Request
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
           persist-credentials: false
@@ -64,7 +64,7 @@ jobs:
         if: runner.debug
 
       - name: Check out Pull Request
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
           persist-credentials: false

.github/workflows/sync-labels.yml

@@ -10,7 +10,7 @@ jobs:
     if: github.repository == 'Homebrew/homebrew-cask'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           persist-credentials: false
 

.github/workflows/sync-templates-and-ci-config.yml

@@ -24,12 +24,12 @@ jobs:
           - Homebrew/homebrew-cask-versions
     steps:
       - name: Clone main repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           persist-credentials: false
 
       - name: Clone secondary repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: ${{ matrix.repo }}
           path: vendor/${{ matrix.repo }}