Use retry that supports 'new_command_on_retry'

Author: dlh01

.github/workflows/phpunit.yml

@@ -65,7 +65,7 @@ jobs:
         run: composer validate --strict
 
       - name: Install Composer dependencies
-        uses: nick-invision/retry@v1
+        uses: nick-invision/retry@v2
         with:
           timeout_minutes: 5
           max_attempts: 5