Bump tested up to version to 6.9 (#116)

Author: tubiz

readme.txt

@@ -3,7 +3,7 @@ Contributors: tubiz
 Donate link: https://bosun.me/donate
 Tags: paystack, woocommerce, payment gateway, mastercard, visa
 Requires at least: 6.2
-Tested up to: 6.8
+Tested up to: 6.9
 Stable tag: 5.8.2
 Requires PHP: 7.4
 License: GPLv2 or later