Bundled Themes: Update schema version in style variation files.
This ensures that settings and styles are properly handled by code editors that support schema.
Reference: [https://developer.wordpress.org/block-editor/reference-guides/theme-json-reference/theme-json-v2/#json-schema Theme.json Version 2 Reference: JSON Schema].
Follow-up to [58403].
Props poena, umeshsinghin.
Fixes #61789.
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