Mute org.elasticsearch.xpack.esql.qa.multi_node.RestEsqlIT testWarningHeadersOnFailedConversions {ASYNC} elastic#120980

Author: elasticsearchmachine

muted-tests.yml

@@ -464,3 +464,6 @@ tests:
 - class: org.elasticsearch.xpack.esql.qa.multi_node.RestEsqlIT
   method: testInternalRange {ASYNC}
   issue: https://github.com/elastic/elasticsearch/issues/120979
+- class: org.elasticsearch.xpack.esql.qa.multi_node.RestEsqlIT
+  method: testWarningHeadersOnFailedConversions {ASYNC}
+  issue: https://github.com/elastic/elasticsearch/issues/120980