Merge pull request rails#51085 from eugeneius/prune_thread_cache

Author: eugeneius

activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb

@@ -135,6 +135,7 @@ def query_cache_enabled
 
         private
           def prune_thread_cache
+            super
             dead_threads = @thread_query_caches.keys.reject(&:alive?)
             dead_threads.each do |dead_thread|
               @thread_query_caches.delete(dead_thread)