Bump grpc-gateway version

[johanbrandhorst]

Bump grpc-gateway to grpc-ecosystem/grpc-gateway#497 for cockroachdb/cockroach#20983.

Also includes ca29dc9.

[benesch]

This is pushed to origin as branch johanbrandhorst/bump-grpc-gateway.

[johanbrandhorst]

Yes.. is that incorrect? I read through the instructions on https://github.com/cockroachdb/cockroach/blob/master/build/README.md#dependencies, was I not supposed to do it like this?

[benesch]

No, you did it exactly right! Unfortunately the instructions are a little bit out of date. I'll merge this PR after your cockroachdb/cockroach PR lands; in the meantime, the existence of the equivalent origin branch means CI will be able to find those commits when you bump the submodule ref in your cockroachdb/cockroach PR.

[johanbrandhorst]

I've force pushed to my branch so I think the local copy will need to be updated :(

[johanbrandhorst]

Apparently this may not need to be rebased after all, as long as we merge this into master at some point? Submodules confuse me.

[benesch]

Sorry for confusing you by creating a branch! Glad we got this merged.