How to modify the paths of js from twentytwelve theme?

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Google-hosted jQuery:

function my_scripts() {
    wp_dequeue_script('jquery');

    wp_enqueue_script(
        'jquery', // name
        '//ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js', // google hosted, protocol-independent
        array(), // dependencies (empty)
        NULL, // removes version
        true // load in footer, 'false' for header
    );

}    
add_action('wp_enqueue_scripts', 'my_scripts');