Update version-sync requirement from 0.8 to 0.9 (#61)
Update version-sync requirement from 0.8 to 0.9 (#61)

Updates the requirements on [version-sync](https://github.com/mgeisler/version-sync) to permit the latest version.
- [Release notes](https://github.com/mgeisler/version-sync/releases)
- [Commits](https://github.com/mgeisler/version-sync/compare/0.8.0...0.9.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

Co-authored-by: dependabot-preview[bot] <6a4c1c4838f800d1998274cd5234e1f65c55e90c@users.noreply.github.com>
jonas-schievink/xml-rpc-rs