Fix Windows-cache

Author: tvdijen

.github/workflows/php.yml

@@ -142,7 +142,7 @@ jobs:
         uses: actions/cache@v5
         with:
           path: $COMPOSER_CACHE
-          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**\composer.json') }}
           restore-keys: ${{ runner.os }}-composer-
 
       - name: Install Composer dependencies