Fix CI dependency cache

Author: tvdijen

.github/workflows/php.yml

@@ -80,7 +80,7 @@ jobs:
       - name: Cache composer dependencies
         uses: actions/cache@v4
         with:
-          path: $COMPOSER_CACHE
+          path: ${{ env.COMPOSER_CACHE }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
           restore-keys: ${{ runner.os }}-composer-
 
@@ -145,7 +145,7 @@ jobs:
       - name: Cache composer dependencies
         uses: actions/cache@v4
         with:
-          path: $COMPOSER_CACHE
+          path: ${{ env.COMPOSER_CACHE }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
           restore-keys: ${{ runner.os }}-composer-
 
@@ -183,7 +183,7 @@ jobs:
       - name: Cache composer dependencies
         uses: actions/cache@v4
         with:
-          path: $COMPOSER_CACHE
+          path: ${{ env.COMPOSER_CACHE }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
           restore-keys: ${{ runner.os }}-composer-
 
@@ -237,7 +237,7 @@ jobs:
       - name: Cache composer dependencies
         uses: actions/cache@v4
         with:
-          path: $COMPOSER_CACHE
+          path: ${{ env.COMPOSER_CACHE }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
           restore-keys: ${{ runner.os }}-composer-