fix: lease_connection -> connection

Author: BuonOmo

test/cases/primary_keys_test.rb

@@ -103,7 +103,7 @@ class Rocket < ActiveRecord::Base
     end
 
     def setup
-      connection = ActiveRecord::Base.lease_connection
+      connection = ActiveRecord::Base.connection
       connection.execute <<-SQL
         CREATE TABLE rockets(
           id SERIAL PRIMARY KEY USING HASH WITH (bucket_count=4)

test/cases/schema_dumper_test.rb

@@ -207,7 +207,7 @@ def down
       $stdout = original
     end
 
-    if ActiveRecord::Base.lease_connection.supports_check_constraints?
+    if ActiveRecord::Base.connection.supports_check_constraints?
       def test_schema_dumps_check_constraints
         constraint_definition = dump_table_schema("products").split(/\n/).grep(/t.check_constraint.*products_price_check/).first.strip
         if current_adapter?(:Mysql2Adapter)