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]>

.github/workflows/code-style.yml

@@ -8,7 +8,7 @@ jobs:
   php-cs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         name: Checkout repository
 
       - name: Setup PHP

.github/workflows/laravel.yml

@@ -22,7 +22,7 @@ jobs:
     name: PHP ${{ matrix.php }} / Laravel ${{ matrix.laravel }} on ${{ matrix.operating-system }} with ${{ matrix.dependencies }} dependencies
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         name: Checkout repository
 
       - name: Cache dependencies

.github/workflows/security-checks.yml

@@ -17,7 +17,7 @@ jobs:
     name: PHP ${{ matrix.php }} on ${{ matrix.operating-system }} with ${{ matrix.dependencies }} dependencies
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         name: Checkout repository
 
       - name: Setup PHP

.github/workflows/slim.yml

@@ -17,7 +17,7 @@ jobs:
     name: PHP ${{ matrix.php }} / Slim ${{ matrix.slim }} on ${{ matrix.operating-system }} with ${{ matrix.dependencies }} dependencies
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         name: Checkout repository
 
       - name: Cache dependencies