Mute org.elasticsearch.xpack.application.ModelRegistryUpgradeIT testUpgradeModels {upgradedNodes=0} elastic#125549

Author: elasticsearchmachine

muted-tests.yml

@@ -483,3 +483,6 @@ tests:
 - class: org.elasticsearch.xpack.esql.ccq.MultiClusterSpecIT
   method: test {range.Invalid boundaries date}
   issue: https://github.com/elastic/elasticsearch/issues/126084
+- class: org.elasticsearch.xpack.application.ModelRegistryUpgradeIT
+  method: testUpgradeModels {upgradedNodes=0}
+  issue: https://github.com/elastic/elasticsearch/issues/125549