Update websocket requirement from 0.22 to 0.23 (#451)
Update websocket requirement from 0.22 to 0.23 (#451)

Updates the requirements on [websocket](https://github.com/websockets-rs/rust-websocket) to permit the latest version.
- [Release notes](https://github.com/websockets-rs/rust-websocket/releases)
- [Commits](https://github.com/websockets-rs/rust-websocket/compare/v0.22.0...v0.23.0)

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