Upgrade tonic to latest version

[cbrit]

This might require upgrading other dependencies and upgrading other repos' tonic version as well.

Depends on #41

[EricBolten]

Since we're moving forward with the design of importing gravity bridge code, the only way to resolve this will be for the bridge to update to a more recent version of tonic.

[cbrit]

Since we're moving forward with the design of importing gravity bridge code, the only way to resolve this will be for the bridge to update to a more recent version of tonic.

gravity rust crates are depending on an iqlusion fork of deep_space which in turn is using a cosmos-sdk-proto version that requires tonic 0.4.*. I think the resulting inclusion of two versions of tonic and related proto building crates in Cargo.lock is causing some problems.

[cbrit]

I've created an issue in the gravity-bridge repo to complete the above tech debt work which will unblock this issue.

PeggyJV/gravity-bridge#468