Decryption key:
* Fix - PHPCompatibility errors reported by the QIT test.
* Dev - Bump WooCommerce "tested up to" version 9.1.
* Dev - Bump WooCommerce minimum supported version to 8.9.
* Dev - Bump WordPress minimum supported version to 6.4.
* Dev - Bump WordPress "tested up to" version 6.6.
* Dev - Update NPM packages and node version to v20 to modernize developer experience.
* Dev - Fix QIT E2E tests and add support for a few new test types.