Bump @polkadot/util from 12.6.2 to 13.0.2 in /frontend

Bumps [@polkadot/util](https://github.com/polkadot-js/common/tree/HEAD/packages/util) from 12.6.2 to 13.0.2.
- [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/v13.0.2/packages/util)

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

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

Author: dependabot[bot]

frontend/package.json

@@ -19,7 +19,7 @@
     "@polkadot/extension-inject": "^0.47.3",
     "@polkadot/keyring": "^12.6.2",
     "@polkadot/types": "^11.0.2",
-    "@polkadot/util": "^12.6.2",
+    "@polkadot/util": "^13.0.2",
     "@polkadot/util-crypto": "^12.6.2",
     "@radix-ui/react-dropdown-menu": "^2.0.6",
     "@radix-ui/react-hover-card": "^1.0.7",