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

muted-tests.yml

@@ -462,3 +462,6 @@ tests:
 - class: org.elasticsearch.analysis.common.CommonAnalysisClientYamlTestSuiteIT
   method: test {yaml=analysis-common/40_token_filters/stemmer_override file access}
   issue: https://github.com/elastic/elasticsearch/issues/121625
+- 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