ci: add PHP 8.4 setup to fix composer install failures

Author: Vitexus

.github/workflows/php.yml

@@ -17,6 +17,11 @@ jobs:
     steps:
     - uses: actions/checkout@v6
 
+    - name: Setup PHP 8.4
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: "8.4"
+
     - name: Validate composer.json and composer.lock
       run: composer validate --strict
 
@@ -25,15 +30,9 @@ jobs:
       uses: actions/cache@v5
       with:
         path: vendor
-        key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+        key: ${{ runner.os }}-php-${{ hashFiles("**/composer.lock") }}
         restore-keys: |
           ${{ runner.os }}-php-
 
     - name: Install dependencies
       run: composer install --prefer-dist --no-progress
-
-    # Add a test script to composer.json, for instance: "test": "vendor/bin/phpunit"
-    # Docs: https://getcomposer.org/doc/articles/scripts.md
-
-    # - name: Run test suite
-    #   run: composer run-script test