Compatibility testing with WordPress 6.9

[qasumitbagthariya]

All Submissions:

• Does your code follow the WooCommerce Sniffs variant of WordPress coding standards?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?
• Will this change require new documentation or changes to existing documentation?

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Changes proposed in this Pull Request:

Bump WordPress "tested up to" version 6.9.

Closes #104

Steps to test the changes in this Pull Request:

1. Run the e2e test using GitHub action to test this PR.
2. All tests should be passed.

Changelog entry

Dev - Bump WordPress "tested up to" version 6.9