github-actions(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] <support@github.com>

.github/workflows/ci.yaml

@@ -14,7 +14,7 @@ jobs:
 
         steps:
             - name: "Checkout code"
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
 
             - name: PHP-CS-Fixer
               uses: docker://oskarstark/php-cs-fixer-ga:2.18.3
@@ -28,7 +28,7 @@ jobs:
 
         steps:
             - name: "Checkout code"
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
 
             - name: composer-normalize
               uses: docker://ergebnis/composer-normalize-action:0.8.0
@@ -45,7 +45,7 @@ jobs:
 
         steps:
             - name: "Checkout code"
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
 
             - name: Install PHP
               uses: shivammathur/setup-php@2.25.5
@@ -80,7 +80,7 @@ jobs:
 
         steps:
             - name: "Checkout code"
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
 
             - name: Install PHP with extensions
               uses: shivammathur/setup-php@2.25.5