Update theme.json version

[ajlende]

Description

With #36155 the schema version needs to be updated to 2.

It looks like the v2 properties were updated without updating the version, so this is the only change needed.

Version 1 is not allowed because the new properties are not available in version 1. This will help folks see which properties need updating when switching to version 2.

How has this been tested?

See that version 2 theme.json files work with the schema

Types of changes

Fix

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

[vcanales]

LGTM!

[vcanales]

LGTM!

[oandregal]

Hi, was looking and this and wondered if there a way to say:

• this property version is present since 5.8
• its value was changed to 2 in 5.9

[ajlende]

I think trying to add notes to that level of detail would be too difficult to keep updated. We could also just remove those version notes completely since we have tagged versioning now. However, it's still kind of nice when using trunk to see when things were added without having to open all the previous versions.

[colorful-tones]

I do think that we need to update the "Version of theme.json to use.\nSince 5.8.", to be "Version of theme.json to use.\nSince 5.9.", correct? Because v2 of theme.json is not available until WordPress 5.9 release.

[colorful-tones]

Oh, I think I see my confusion. We're describing the property introductory version. Super confusing!

We could also just remove those version notes completely since we have tagged versioning now.

I would vote for this based on my example of confusion. 🤦

[Mamaduka]

Cherry-picked for 5.9.1.