Fix test failure (#116532)

This commit fixes a test failure by using the latest known version
instead of the latest version from a map. 

fixes: #116520

Author: jakelandis

muted-tests.yml

@@ -212,9 +212,6 @@ tests:
 - class: org.elasticsearch.xpack.searchablesnapshots.SearchableSnapshotsCanMatchOnCoordinatorIntegTests
   method: testSearchableSnapshotShardsAreSkippedBySearchRequestWithoutQueryingAnyNodeWhenTheyAreOutsideOfTheQueryRange
   issue: https://github.com/elastic/elasticsearch/issues/116523
-- class: org.elasticsearch.xpack.core.security.authz.permission.RemoteClusterPermissionsTests
-  method: testCollapseAndRemoveUnsupportedPrivileges
-  issue: https://github.com/elastic/elasticsearch/issues/116520
 - class: org.elasticsearch.xpack.logsdb.qa.StandardVersusLogsIndexModeRandomDataDynamicMappingChallengeRestIT
   method: testMatchAllQuery
   issue: https://github.com/elastic/elasticsearch/issues/116536

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/authz/permission/RemoteClusterPermissionsTests.java

@@ -131,7 +131,9 @@ public void testCollapseAndRemoveUnsupportedPrivileges() {
         // create random groups with random privileges for random clusters
         List<RemoteClusterPermissionGroup> randomGroups = generateRandomGroups(true);
         // replace a random value with one that is allowed
-        String singleValidPrivilege = randomFrom(RemoteClusterPermissions.allowedRemoteClusterPermissions.get(TransportVersion.current()));
+        String singleValidPrivilege = randomFrom(
+            RemoteClusterPermissions.allowedRemoteClusterPermissions.get(lastTransportVersionPermission)
+        );
         groupPrivileges.get(0)[0] = singleValidPrivilege;
 
         for (int i = 0; i < randomGroups.size(); i++) {