Mute org.elasticsearch.xpack.ml.integration.ClassificationIT testWithOnlyTrainingRowsAndTrainingPercentIsFifty_DependentVariableIsKeyword elastic#122908

Author: elasticsearchmachine

muted-tests.yml

@@ -455,3 +455,6 @@ tests:
   issue: https://github.com/elastic/elasticsearch/issues/122668
 - class: org.elasticsearch.telemetry.apm.ApmAgentSettingsIT
   issue: https://github.com/elastic/elasticsearch/issues/122546
+- class: org.elasticsearch.xpack.ml.integration.ClassificationIT
+  method: testWithOnlyTrainingRowsAndTrainingPercentIsFifty_DependentVariableIsKeyword
+  issue: https://github.com/elastic/elasticsearch/issues/122908