Update tendermint-proto requirement from 0.38 to 0.39 (#227)

* Update tendermint-proto requirement from 0.38 to 0.39

Updates the requirements on [tendermint-proto](https://github.com/informalsystems/tendermint-rs) to permit the latest version.
- [Release notes](https://github.com/informalsystems/tendermint-rs/releases)
- [Changelog](https://github.com/informalsystems/tendermint-rs/blob/main/CHANGELOG.md)
- [Commits](informalsystems/tendermint-rs@v0.38.0...v0.39.1)

---
updated-dependencies:
- dependency-name: tendermint-proto
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

* Add changelog entry

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Romain Ruetschi <romain@informal.systems>

.changelog/unreleased/breaking-changes/227-tendermint-proto-0.39.md

@@ -0,0 +1 @@
+- Update `tendermint-proto` to v0.39 ([\#227](https://github.com/cosmos/ibc-proto-rs/pull/227))

Cargo.toml

@@ -48,7 +48,7 @@ scale-info         = { version = "2.1.2", default-features = false, features = [
 borsh = { version = "1", default-features = false, features = ["derive"], optional = true }
 
 [dependencies.tendermint-proto]
-version          = "0.38"
+version          = "0.39"
 default-features = false
 
 [dev-dependencies]