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] <support@github.com>

.github/workflows/qa.yaml

@@ -13,7 +13,7 @@ jobs:
     name: Test
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Setup PHP with specific version of PECL extension
       uses: shivammathur/setup-php@v2
@@ -49,7 +49,7 @@ jobs:
     steps:
 
     - name: Git checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: markdownlint-cli
       uses: nosborn/github-action-markdown-cli@v1.1.1