build(deps): Bump @cosmjs/proto-signing from 0.31.3 to 0.32.1

Bumps [@cosmjs/proto-signing](https://github.com/cosmos/cosmjs) from 0.31.3 to 0.32.1.
- [Changelog](https://github.com/cosmos/cosmjs/blob/main/CHANGELOG.md)
- [Commits](https://github.com/cosmos/cosmjs/commits)

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

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

package.json

@@ -57,7 +57,7 @@
     "@cosmjs/crypto": "^0.32.0",
     "@cosmjs/encoding": "^0.31.3",
     "@cosmjs/math": "^0.32.0",
-    "@cosmjs/proto-signing": "^0.31.3",
+    "@cosmjs/proto-signing": "^0.32.1",
     "@cosmjs/stargate": "^0.31.3",
     "@cosmjs/tendermint-rpc": "^0.31.3",
     "@cosmjs/utils": "^0.31.3",