fix invalid group id generation for v1.13.x (#318)

Co-authored-by: GHTK\huynt2 <[email protected]>

src/Commit/RetryableCommitter.php

@@ -11,6 +11,7 @@
 class RetryableCommitter implements Committer
 {
     private const RETRYABLE_ERRORS = [
+        RD_KAFKA_RESP_ERR_ILLEGAL_GENERATION,
         RD_KAFKA_RESP_ERR_REQUEST_TIMED_OUT,
     ];