chore(deps): bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/linter.yaml

@@ -14,7 +14,7 @@ jobs:
     name: PHP-CS-Fixer
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       # see https://github.com/OskarStark/php-cs-fixer-ga
       - name: PHP-CS-Fixer
         uses: docker://oskarstark/php-cs-fixer-ga
@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 'Checkout code'
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: 'Install PHP with extensions'
         uses: shivammathur/setup-php@v2

.github/workflows/tests-lowest-dependencies.yaml

@@ -22,7 +22,7 @@ jobs:
                 php-version: ['8.0']
         steps:
             - name: 'Checkout code'
-              uses: actions/checkout@v6
+              uses: actions/checkout@v7
 
             - name: 'Install PHP with extensions'
               uses: shivammathur/setup-php@v2

.github/workflows/tests-maintained-symfony.yaml

@@ -31,7 +31,7 @@ jobs:
                       symfony-version: '7.4'
         steps:
             - name: 'Checkout code'
-              uses: actions/checkout@v6
+              uses: actions/checkout@v7
 
             - name: 'Install PHP with extensions'
               uses: shivammathur/setup-php@v2

.github/workflows/tests-stable.yaml

@@ -24,7 +24,7 @@ jobs:
                 symfony-version: ['7.4']
         steps:
             - name: 'Checkout code'
-              uses: actions/checkout@v6
+              uses: actions/checkout@v7
 
             - name: 'Install PHP with extensions'
               uses: shivammathur/setup-php@v2

.github/workflows/tests-upcoming-php.yaml

@@ -23,7 +23,7 @@ jobs:
                 symfony-version: ['7.4']
         steps:
             - name: 'Checkout code'
-              uses: actions/checkout@v6
+              uses: actions/checkout@v7
 
             - name: 'Install PHP with extensions'
               uses: shivammathur/setup-php@v2

.github/workflows/tests-upcoming-symfony.yaml

@@ -24,7 +24,7 @@ jobs:
                 symfony-version: ['7.4']
         steps:
             - name: 'Checkout code'
-              uses: actions/checkout@v6
+              uses: actions/checkout@v7
 
             - name: 'Install PHP with extensions'
               uses: shivammathur/setup-php@v2