Add testing notes

Author: tarhi-saad

docs/internal-developers/testing/releases/965.md

@@ -0,0 +1,13 @@
+# Testing notes and ZIP for release 9.6.5
+
+Zip file for testing: [woocommerce-gutenberg-products-block.zip](https://github.com/woocommerce/woocommerce-blocks/files/10899628/woocommerce-gutenberg-products-block.zip)
+
+
+## WooCommerce Core
+
+### Checkout: Fix state validation after changing shipping country. ([8633](https://github.com/woocommerce/woocommerce-blocks/pull/8633)
+
+1. With a default valid US shipping address set, add an item to the cart and proceed to checkout.
+2. Change the shipping address country to India. You will see an error about the incorrect postcode.
+3. Select an India state from the dropdown. You will see an error about the incorrect postcode.
+4. Enter a valid postcode `411014`. All errors should go away.

docs/internal-developers/testing/releases/README.md

@@ -123,6 +123,7 @@ Every release includes specific testing instructions for new features and bug fi
     -   [9.6.2](./962.md)
     -   [9.6.3](./963.md)
     -   [9.6.4](./964.md)
+    -   [9.6.5](./965.md)
 
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