[Finishes #54497218] Upgrade JDBC adapter to 1.3

This allows us to remove the monkeypatch for 'pluck' that fixed Rails 3.2.14 for the previous version of the adapter

Compatibility changes:
  * 'exec_query' now freaks out if you're doing something that doesn't return rows (CREATE TABLE or DROP TABLE).
    We now use 'execute' for those scenarios (only in test).
  * ActiveRecord::ConnectionAdapters::PostgreSQLColumn.new(...) now returns bad results if you don't give a column name (first arg).
    So we give it a column name.
  * ActiveRecord::ConnectionAdapters::PostgreSQLColumn.new(...).type now returns "integer" for Greenplum's "integer[]",
    which is a little scary.