Fix deprecated set-output

Author: tvdijen

.github/workflows/php.yml

@@ -43,9 +43,13 @@ jobs:
 
       - uses: actions/checkout@v3
 
-      - name: Get composer cache directory
-        id: composer-cache
-        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+      - name: Get composer cache directory (linux)
+        if: ${{ matrix.operating-system == 'ubuntu-latest' }}
+        run: echo "COMPOSER_CACHE=$(composer config cache-files-dir)" >> $GITHUB_ENV
+
+      - name: Get composer cache directory (windows)
+        if: ${{ matrix.operating-system == 'windows-latest' }}
+        run: echo "COMPOSER_CACHE=$(composer config cache-files-dir)" >> $env:GITHUB_ENV
 
       - name: Cache composer dependencies
         uses: actions/cache@v3