Don't need prefer-dist

Author: GrahamCampbell

.github/workflows/tests.yml

@@ -33,7 +33,7 @@ jobs:
         with:
           timeout_minutes: 5
           max_attempts: 5
-          command: composer update --prefer-dist --no-interaction --no-progress
+          command: composer update --no-interaction --no-progress
 
       - name: Install PHPUnit
         uses: nick-invision/retry@v1