Is your feature request related to a problem or challenge? Please describe what you are trying to do.

Update IOx, which depends on arrow-flight, to use prost 0.9

Describe the solution you'd like

Update prost to 0.9 and tonic to 0.6.1

Describe alternatives you've considered

Having two versions of prost and by extension tonic in the same binary, this doesn't work if you wish to expose the services on the same port

Additional context

None