New cosmos-sdk-proto release

[ljoss17]

A new release of cosmos-sdk-proto with the bumped version of tendermint-rs to v0.40.0 is required by Hermes.

@tony-iqlusion is there a preference for the version number between v0.25.1 and v0.26.0?

[tony-iqlusion]

The downstream tendermint* crates are re-exported through the public APIs of cosmos-sdk-proto and cosmrs, so any time they have SemVer breaking changes, it's also a SemVer breaking change to cosmos-sdk-proto and cosmrs.

That means they need to be 0.26 and 0.21 respectively. I can cut a new release.

[ljoss17]

Ok thank you!

[tony-iqlusion]

Released in #508