Unmute XPackRestIT

Author: davidkyle

muted-tests.yml

@@ -342,8 +342,6 @@ tests:
 - class: org.elasticsearch.action.search.SearchQueryThenFetchAsyncActionTests
   method: testMinimumVersionShardDuringPhaseExecution
   issue: https://github.com/elastic/elasticsearch/issues/114611
-- class: org.elasticsearch.xpack.test.rest.XPackRestIT
-  issue: https://github.com/elastic/elasticsearch/issues/114723
 - class: org.elasticsearch.kibana.KibanaThreadPoolIT
   method: testBlockedThreadPoolsRejectUserRequests
   issue: https://github.com/elastic/elasticsearch/issues/113939