// Disable Contact Form 7 plugin update
function disable_contact_form_7_update( $value ) {
    if ( isset( $value ) && is_object( $value ) && isset( $value->response ) ) {
        $plugin_path = 'contact-form-7/wp-contact-form-7.php';

        if ( isset( $value->response[ $plugin_path ] ) ) {
            unset( $value->response[ $plugin_path ] );
        }
    }

    return $value;
}
add_filter( 'site_transient_update_plugins', 'disable_contact_form_7_update' );