Add Support for phpunit using PHP 8.1 and 8.2 to CI

[kevinfodness]

Description

I would like to see unit tests that test Publish to Apple News using PHP 8.1 and 8.2.

Use Case

Run phpunit using PHP 8.1 and 8.2.

Acceptance Criteria

• Ensure that phpunit is configured to run on PHP 8.1 and PHP 8.2 in GitHub Actions.
• Ensure all phpunit tests pass in PHP 8.1 and PHP 8.2
• Add the new PHP 8.1 and PHP 8.2 phpunit tests to branch protections (requires admin, ask a lead dev to do this).

Technical Details

• This should be done after Update GitHub workflows #1017, once phpunit is using the new reusable workflow.

[SiteBastion]

Since PHP 8 is now EOF, can this get a bump/ETA? Some hosts are forcing updates to 8.1 with 8.2 being preferred and also set to default for all new installs (WPEngine for instance)

Also, will test on 8.1/8.2 in coming week.

[kevinfodness]

@SiteBastion We are working on this currently.