[TASK] Use PHP 8.3 in CGL workflow

Author: eliashaeussler

.github/settings.yml

@@ -109,6 +109,12 @@ rulesets:
               integration_id: 15368
             - context: 'Tests (PHP 8.3 & lowest dependencies)'
               integration_id: 15368
+            - context: 'Tests (PHP 8.4 & locked dependencies)'
+              integration_id: 15368
+            - context: 'Tests (PHP 8.4 & highest dependencies)'
+              integration_id: 15368
+            - context: 'Tests (PHP 8.4 & lowest dependencies)'
+              integration_id: 15368
             - context: 'Test coverage'
               integration_id: 15368
     bypass_actors:

.github/workflows/cgl.yaml

@@ -20,7 +20,8 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: 8.4
+          # @todo Use PHP 8.4 once PHP-CS-Fixer supports PHP 8.4
+          php-version: 8.3
           tools: composer:v2, composer-require-checker, composer-unused, cs2pr
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/tests.yaml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php-version: ["8.1", "8.2", "8.3"]
+        php-version: ["8.1", "8.2", "8.3", "8.4"]
         dependencies: ["locked", "highest", "lowest"]
     steps:
       - uses: actions/checkout@v4