Mute org.elasticsearch.xpack.test.rest.XPackRestIT test {p0=snapshot/10_basic/Failed to snapshot indices with synthetic source} elastic#120332

Author: elasticsearchmachine

muted-tests.yml

@@ -458,3 +458,6 @@ tests:
 - class: org.elasticsearch.xpack.ml.integration.ClassificationIT
   method: testWithOnlyTrainingRowsAndTrainingPercentIsFifty_DependentVariableIsKeyword
   issue: https://github.com/elastic/elasticsearch/issues/122908
+- class: org.elasticsearch.xpack.test.rest.XPackRestIT
+  method: test {p0=snapshot/10_basic/Failed to snapshot indices with synthetic source}
+  issue: https://github.com/elastic/elasticsearch/issues/120332