Sync proto file with latest dev

[tellet-q]

• sync proto files
• fix test

All Submissions:

• Contributions should target the dev branch. Did you create your branch from dev?
• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

[timvisee]

Please also run cargo test --test protos to generate the necessary client files.

[timvisee]

Looks good.

Let's leave this one hanging until we actually want to publish the client for 1.16. For now we can simply source the client from this branch.