Merge pull request rails#46427 from cpb/cpb-fix-clear-reloadable-connections-deprecation-warning

Fix clear_reloadable_connections! deprecation warning

Author: jonathanhefner

actioncable/test/subscription_adapter/postgresql_test.rb

@@ -60,7 +60,7 @@ def active?
       assert_equal "hello world", queue.pop
     end
 
-    ActiveRecord::Base.clear_reloadable_connections!
+    ActiveRecord::Base.connection_handler.clear_reloadable_connections!
 
     assert adapter.active?
   end