Mention ojdbc11/ojdbc17 in the NameError LoadError message

When Java::oracle.jdbc.OracleDriver resolves a NameError because the
Oracle JDBC jar is missing from the classpath, include a short hint
telling the user which jars to install.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: yahonda

lib/plsql/jdbc_connection.rb

@@ -51,7 +51,7 @@ class JDBCConnection < Connection  # :nodoc:
       ORACLE_DRIVER = Java::oracle.jdbc.OracleDriver.new
       java.sql.DriverManager.registerDriver ORACLE_DRIVER
     rescue NameError
-      raise LoadError, "ERROR: ruby-plsql could not load Oracle JDBC driver."
+      raise LoadError, "ERROR: ruby-plsql could not load Oracle JDBC driver. Please install ojdbc11.jar or ojdbc17.jar."
     end
 
     def self.create_raw(params)