Link to the Oracle JDBC downloads page in the LoadError message

Point users who hit the "could not load Oracle JDBC driver" error to
Oracle's official JDBC downloads page so they can pick a suitable
ojdbc jar for their Java version.

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

Author: yahonda

lib/plsql/jdbc_connection.rb

@@ -51,7 +51,9 @@ 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. Please install Oracle JDBC driver like ojdbc17.jar."
+      raise LoadError, "ERROR: ruby-plsql could not load Oracle JDBC driver. " \
+        "Please install Oracle JDBC driver like ojdbc17.jar. " \
+        "See https://www.oracle.com/database/technologies/appdev/jdbc-downloads.html"
     end
 
     def self.create_raw(params)