ibc: use ibc-types 0.3.0 instead of main

[avahowell]

No description provided.

[conorsch]

Failing WASM check: @avahowell suspects we just need to click on the std feature for the ibc-types dep.

[conorsch]

Heads up, we just merged penumbra-zone/ibc-types#38 which we'll definitely want in for Testnet 56. If subsequent testing with #2803 looks good, we'll either want to bump ibc-types to 0.3.1 to include the latest, or keep the dep on main for now. What we don't want is to pin 0.3.0 of ibc-types for 56, which would ship a known-bad ibc implementation.

[conorsch]

What we don't want is to pin 0.3.0 of ibc-types for 56, which would ship a known-bad ibc implementation

We're OK for Testnet 56: we're using a git dep of the ibc-types crates, so the 0.3.0 version will use the latest from the remote. We've not created a tag for 0.3.0, although we probably should soon.