`manifest.json` schema incorrect for `"format_version": 3`.

[IllagerCaptain]

Describe the bug
The manifest.json schema references the "format_version": 2 schema when the format_version is 3.

To Reproduce

1. Use a valid "format_version": 3 manifest.json.
2. Suffer.

Expected behavior
It would reference the proper schema when the format_version is 3.