update usage of set-output

Author: svpernova09

.github/workflows/php.yml

@@ -10,25 +10,32 @@ jobs:
     name: PHP ${{ matrix.php }}
     steps:
       - uses: actions/checkout@v4
+
       - name: Install PHP
         uses: shivammathur/setup-php@master
         with:
           php-version: ${{ matrix.php }}
+
       - name: Report PHP version
         run: php -v
+
       - name: Validate composer.json and composer.lock
         run: composer validate
+
       - name: Get Composer Cache Directory
         id: composer-cache
-        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
       - name: Cache dependencies
         uses: actions/cache@v4
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: ${{ matrix.php }}-composer-${{ hashFiles('**/composer.lock') }}
           restore-keys: ${{ matrix.php }}-composer-
+
       - name: Install dependencies
         run: composer install --prefer-dist --no-progress --no-suggest
+
       - name: Run test suite
         run: vendor/bin/phpunit