chore(deps): bump @polkadot/util from 12.4.2 to 12.5.1 in /javascript

Bumps [@polkadot/util](https://github.com/polkadot-js/common/tree/HEAD/packages/util) from 12.4.2 to 12.5.1.
- [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/v12.5.1/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>

javascript/package.json

@@ -33,7 +33,7 @@
   },
   "dependencies": {
     "@polkadot/keyring": "^12.4.2",
-    "@polkadot/util": "^12.4.2",
+    "@polkadot/util": "^12.5.1",
     "@polkadot/util-crypto": "^12.4.2",
     "@types/chai": "^4.3.6",
     "chai": "^4.3.8"