Update arrow-flight with is_update field

[alamb]

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

• Related to [FlightSQL] Add is_update field to ActionCreatePreparedStatementResult arrow#49497

see vote https://lists.apache.org/thread/vpvqppjpv51gfcd7pqvozg3h7d5hnooh

It looks likely that the arrow-flight spec will add a new "is_update" field for ActionCreatePreparedStatementResult

We should update arrow-rs with this update too

Describe the solution you'd like

1. Update the FlightSQL protobuf definitions
2. Regenerate the rust structures
3. Add tests

Describe alternatives you've considered

Additional context