WooCommerce Xero Integration 1.9.1

1.9.1

* Fix - Use a separate country list for the report tax type when creating a tax rate in Xero.
* Dev - Update secret key encryption to use the Sodium library for token encryption.
* Dev - Upgrade the `xeroapi/xero-php-oauth2` SDK from version 2.20.0 to version 7.2.0.
* Dev - Bump WooCommerce "tested up to" version 9.4.
* Dev - Bump WooCommerce minimum supported version to 9.2.
* Dev - Bump WordPress minimum supported version to 6.5.
* Dev - Remove Xero OAuth 1.0 Authentication as it is fully deprecated.

* Fix - PHPCompatibility errors reported by the QIT test.
* Dev - Bump WooCommerce "tested up to" version 9.2.
* Dev - Bump WooCommerce minimum supported version to 9.0.
* Dev - Fix QIT E2E tests and add support for a few new test types.