fix: make new debugging arg optional to avoid potential fatals

[dkoo]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go 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:

Automattic/newspack-plugin#3676 added a new third param to the newspack_recaptcha_verify_captcha filter hook for debugging purposes. However, to avoid potential fatal errors and maintain backwards-compatibility with Newspack Plugin releases older than v5.11.1, this PR makes the new param optional.

How to test the changes in this Pull Request:

A code review should suffice.

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 ran tests with your changes locally?

[dkoo]

Thanks, @chickenn00dle! I rebased against release as it's a hotfix (just in case there are sites out there running older release builds). Merging...

[matticbot]

🎉 This PR is included in version 4.5.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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