fix: use lowercase builder method for limit field

Lombok generates builder methods from field names (lowercase).

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

Author: hifaizsk

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

@@ -945,7 +945,7 @@ void testGetRetentionPolicyRuns() throws Exception {
       var resp =
           client
               .chat()
-              .getRetentionPolicyRuns(GetRetentionPolicyRunsRequest.builder().Limit(10).build())
+              .getRetentionPolicyRuns(GetRetentionPolicyRunsRequest.builder().limit(10).build())
               .execute();
 
       assertNotNull(resp.getData(), "GetRetentionPolicyRuns response should not be null");