chore: release v6.1.9

[childrentime]

Note

Fix useRafState batching behavior

• Queue and accumulate pending updates within requestAnimationFrame, applying them via functional setState so multiple consecutive updates in one frame are all processed (was only last applied)
• Add tests covering multiple functional updates and mixed value/functional updates in useRafState
• Bump @reactuses/core to 6.1.9 and update changelogs in packages/core/changelog.md and packages/website-docusaurus/docs/changelog.md

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