Unmute testLookupExplosionManyMatchesManyFields test

Unmute testLookupExplosionManyMatchesManyFields test

Author: julian-elastic

muted-tests.yml

@@ -519,9 +519,6 @@ tests:
 - class: org.elasticsearch.xpack.ml.integration.BasicDistributedJobsIT
   method: testFailOverBasics
   issue: https://github.com/elastic/elasticsearch/issues/136778
-- class: org.elasticsearch.xpack.esql.heap_attack.HeapAttackIT
-  method: testLookupExplosionManyMatchesManyFields
-  issue: https://github.com/elastic/elasticsearch/issues/136791
 - class: org.elasticsearch.xpack.inference.qa.mixed.CohereServiceMixedIT
   method: testRerank
   issue: https://github.com/elastic/elasticsearch/issues/136872