fix 7.2 trailing comma

Author: rhysemmerson

tests/InvalidateCacheTest.php

@@ -33,7 +33,7 @@ protected function setUp(): void
         });
 
         $this->middleware = new CacheMiddleware(new PrivateCacheStrategy(
-            new Psr6CacheStorage(new ArrayCachePool()),
+            new Psr6CacheStorage(new ArrayCachePool())
         ));
 
         $stack->push($this->middleware, 'cache');