Fix warning

DEPRECATION WARNING: Calling `ActiveRecord::Base.clear_all_connections! is deprecated. Please call the method directly on the connection handler; for example: `ActiveRecord::Base.connection_handler.clear_all_connections!`.

Author: maximerety

test/test_helper.rb

@@ -54,7 +54,7 @@ def teardown
     @connection.execute("SET statement_timeout TO '70s'")
     @connection.execute("SET lock_timeout TO '70s'")
     ActiveRecord::Migration.verbose = @verbose_was
-    ActiveRecord::Base.clear_all_connections!
+    ActiveRecord::Base.connection_handler.clear_all_connections!
   end
 
   def run_migration(direction = :up)