How to verify the nonce in WordPress if the request is from a link in the menu?

Question

I have a plugin that has a submenu. For example: Dashboard, List of recent questions, Settings, Support.

The submenu is added using the add_submenu_page function.

add_submenu_page(
            'my-plugin',
            'Dashboard',
            'Dashboard',
            'manageoptions',
            'my-plugin&tab=dashboard',
            array(
                $this,
                'get_home_page',
            )
        );

Depending on the value of $_GET['tab'], I open the template I need.

$tab = ( isset( $_GET['tab'] ) ) ? sanitize_text_field( wp_unslash( $_GET['tab'] ) ) : '';

if ( 'dashbord' === $tab ) {
 require_once PLUGIN_DIR . 'templates/dashbord.php';
} elseif ( 'settings' === $tab ) {
 require_once PLUGIN_DIR . 'templates/settings.php';
}

When I check my code with a code sniffer with standard=WooCommerce-Core, it complains to me that "WARNING | Processing form data without nonce verification". On the line where I assign to the variable $tab the value of the array $_GET['tab'].

How to add wp nonce for menu link. And is there any common sense in this?

I tried using FILTER_SANITIZE_STRING for sanitizing. But the new version of php complains about it as a deprecated method.