Patch the PHP-CSS-Parser library to correctly validate the turn unit

[pierlon]

Summary

Applies the changes from MyIntervals/PHP-CSS-Parser#193 as a patch to be made to the PHP-CSS-Parser library.

Fixes #4604

Checklist

• My pull request is addressing an open issue (please create one otherwise).
• My code is tested and passes existing tests.
• My code follows the Engineering Guidelines (updates are often made to the guidelines, check it out periodically).

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[schlessera]

You seem to have modified the Composer lock file so that it points to this branch for its libraries. I think that that will break as soon as this is merged, as the composer install will not be able to find the branch that is being referenced in the lock file.

[schlessera]

This might be caused by the recent change I did to avoid locking the libraries to a branch so we can cross the v2 branch barrier...

What exactly did you run? Only a composer update in the root folder?

[pierlon]

What exactly did you run? Only a composer update in the root folder?

Yep.

[schlessera]

Copied from Slack:

Ok, I got a usable lock file now. However, I did it by running composer update from dev-develop after having deleted the vendor folder. Then I changed into the fix/4604-parse-turn-unit branch and re-ran composer update without deleting the vendor folder.

[westonruter]

Changes check out.

I tried creating a Web Story with a gradient:

Before	After

Also tried adding the test HTML on #4604, here after waiting a couple seconds:

Before	After

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[schlessera]

@googlebot I consent.