Twenty Twenty-Five: Update schema version

[poena]

Twenty Twenty-Five uses the development version of the theme.json schema for the JSON files:
https://schemas.wp.org/trunk/theme.json

The theme needs to use the version of theme.json and the theme.json schema that was valid when the theme was released.
Otherwise, as the schema continue to evolve over time, code editors may show parts of theme.json as invalid.

The last version of the schema for WordPress 6.7 is at ​https://raw.githubusercontent.com/WordPress/gutenberg/wp/6.7/schemas/json/theme.json

Follow up to https://core.trac.wordpress.org/ticket/61342

Trac ticket: https://core.trac.wordpress.org/ticket/62455

This PR updates the schema version for the Twenty Twenty-Five theme as per the requirements in [Ticket #62455].

Key Changes:

Updated schema version to reflect the latest standards and changes.

Schema URL: '​https://schemas.wp.org/wp/6.7/theme.json'

[mukesh27]

The PR ​#7820 LGTM and ready for commit.

[desrosj]

In 59448:

Bundled Theme: Pin a theme.json schema version to Twenty Twenty-Five.

Each theme’s theme.json schema version should be pinned to the version that was valid at the time it was released.

Props im3dabasia1, poena, mukesh27.
Fixes #62455.

[desrosj]

Reopening to consider including in the next theme update, whenever that may be coordinated.

Merged in https://core.trac.wordpress.org/changeset/59448.

[poena]

All json files in the theme needs to have their schema updated.

Trac ticket: https://core.trac.wordpress.org/ticket/62455

This PR updates the $schema URL in all JSON files for the Twenty Twenty-Five theme to use the wp/6.7 schema version instead of the trunk version.

[im3dabasia1]

Thanks @poena. I have raised a PR that updates the schema URLs in all JSON files to use the schema for WordPress 6.7. Here is the ​PR. Let me know if I missed any.

cc: @desrosj

[desrosj]

In 59451:

Bundled Theme: Pin schema version to rest of Twenty Twenty-Five.

All JSON files in the theme should be pinned to the appropriate schema version, not just theme.json.

Follow up to [59448].

Props im3dabasia1, poena.
Fixes #62455.