Update tests.yml

Author: jackbayliss

.github/workflows/tests.yml

@@ -36,7 +36,7 @@ jobs:
         echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
 
     - name: Install PHP dependencies
-      run: composer update --${{ matrix.dependency-version }} --prefer-dist --no-interaction --no-progress --ansi
+      run: composer update --${{ matrix.dependency-version }} --prefer-dist --no-interaction --no-progress --ansi --optimize-autoloader
 
     - name: Install dependencies
       run: npm ci