Bump websocket-driver from 0.7.2 to 0.7.3 (#14410)

Bump websocket-driver from 0.7.2 to 0.7.3 (#14410)

Bumps [websocket-driver](https://github.com/faye/websocket-driver-ruby) from 0.7.2 to 0.7.3.
- [Release notes](https://github.com/faye/websocket-driver-ruby/releases)
- [Changelog](https://github.com/faye/websocket-driver-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/faye/websocket-driver-ruby/compare/0.7.2...0.7.3)

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