optimistic locking (#20)

* optimistic locking

* Update update.js

* Update dependencies in package-lock.json

Upgraded several dependencies including @babel packages, formidable, brace-expansion, and picocolors. Added @paralleldrive/cuid2 and @noble/hashes as new dependencies, and removed hexoid and to-fast-properties. These updates improve compatibility and address potential security or maintenance issues.

* Update overwrite.js

* send version instead of err

* Update overwrite.js

* stop double sending

Author: cubap