fix: remove trailing blank line for spotless

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hifaizsk

src/test/java/io/getstream/ChatMiscIntegrationTest.java

@@ -984,5 +984,4 @@ void testGetRetentionPolicyRuns() throws Exception {
       throw e;
     }
   }
-
 }