Deprecation warning for dynamic properties

PHP 8.2+ is issuing deprecation warnings for the dynamic properties declared in WC_Gateway_Borgun. This is easily remedied by declaring the relevant properties in the class:

class WC_Gateway_Borgun extends WC_Payment_Gateway {
    // [...]

    // declare properties to avoid deprecations error
    private $testmode;
    private $merchantid;
    private $paymentgatewayid;
    private $secretkey;
    private $receipttext;
    private $redirecttext;
    private $successurl;
    private $cancelurl;
    private $errorurl;
    private $langpaymentpage;
    private $notification_email;
    private $TotalLineItem;

    public function __construct() {
    // [...]

Alternatively one could use #[\AllowDynamicProperties], but I think in a payment plugin the better approach is to explicitly declare properties.

Also, Borgun / SaltPay is now of course Teya. Might be nice to update the plugin name / description accordingly to make it easier to find.