Fixes a WP nightly unity test

[vedanshujain]

All Submissions:

• Have you followed the WooCommerce Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

In WP 6.1, a new doing_it_wrong message is being added to prevent checking for cache with boolean key. Seems like we were accidentally using a boolean key in one of the test.

How to test the changes in this Pull Request:

Make sure that tests pass.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?
• Have you created a changelog file for each project being changed, ie pnpm changelog add --filter=<project>?

FOR PR REVIEWER ONLY:

• I have reviewed that everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities. I made sure Linting is not ignored or disabled.

[jorgeatorres]

LGTM. Thanks V!
(Waiting for CI to complete before merging)

[github-actions]

Test Results Summary

Commit SHA: 3110555

Test 🧪	Passed ✅	Failed 🚨	Broken 🚧	Skipped ⏭️	Unknown ❔	Total 📊	Duration ⏱️
API Tests	115	0	0	2	0	117	0m 40s
E2E Tests	185	0	0	1	0	186	11m 20s

To view the full API test report, click here.
To view the full E2E test report, click here.
To view all test reports, visit the WooCommerce Test Reports Dashboard.

[github-actions]

Hi @jorgeatorres, thanks for merging this pull request. Please take a look at these follow-up tasks you may need to perform:

• Add the release: add testing instructions label