build(deps): Bump @cosmjs/encoding from 0.30.1 to 0.31.0

Bumps [@cosmjs/encoding](https://github.com/cosmos/cosmjs) from 0.30.1 to 0.31.0.
- [Changelog](https://github.com/cosmos/cosmjs/blob/main/CHANGELOG.md)
- [Commits](cosmos/cosmjs@v0.30.1...v0.31.0)

---
updated-dependencies:
- dependency-name: "@cosmjs/encoding"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>