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GH-37539: [C++][FlightRPC] Fix binding to IPv6 addresses (#37552)



### Rationale for this change

Binding to an IPv6 address got broken along the way

### What changes are included in this PR?

Fix the binding and see if we can enable IPv6 testing in CI

### Are these changes tested?

If CI permits

### Are there any user-facing changes?

No
* Closes: #37539

Authored-by: David Li <li.davidm96@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>