Fixed composer cache key in github action

Author: ezimuel

.github/workflows/test.yml

@@ -30,9 +30,9 @@ jobs:
       uses: actions/cache@v2
       with:
         path: vendor
-        key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+        key: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ hashFiles('**/composer.lock') }}
         restore-keys: |
-          ${{ runner.os }}-php-${{ matrix.php-version }}
+          ${{ runner.os }}-php-${{ matrix.php-version }}-
 
     - name: Install dependencies
       if: steps.composer-cache.outputs.cache-hit != 'true'