build(deps): bump @polkadot/util from 13.0.2 to 13.2.1

Bumps [@polkadot/util](https://github.com/polkadot-js/common/tree/HEAD/packages/util) from 13.0.2 to 13.2.1.
- [Release notes](https://github.com/polkadot-js/common/releases)
- [Changelog](https://github.com/polkadot-js/common/blob/master/CHANGELOG.md)
- [Commits](https://github.com/polkadot-js/common/commits/v13.2.1/packages/util)

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

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