Update testing instructions for 5.9.0 to include new test plugin zip

Author: opr

docs/testing/releases/590.md

@@ -7,7 +7,7 @@ Zip file for testing: [woocommerce-gutenberg-products-block.zip](https://github.
 ### Add extensibility point for extensions to filter payment methods ([4668](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/4668))
 
 1. Make sure Check payments and Cash on delivery payment methods are activated and appear in the Checkout block
-2. Install this extension specifically made for testing: [woocommerce-payment-method-test.zip](https://github.com/woocommerce/woocommerce-gutenberg-products-block/files/7154980/woocommerce-payment-method-test.zip) - the code it includes is:
+2. Install this extension specifically made for testing: [woocommerce-payment-method-test.zip](https://github.com/woocommerce/woocommerce-gutenberg-products-block/files/7160423/woocommerce-payment-method-test.zip)
 ```js
 import { registerPaymentMethodExtensionCallbacks} from '@woocommerce/blocks-registry';