build(deps): bump @polkadot/keyring from 12.6.1 to 12.6.2

Bumps [@polkadot/keyring](https://github.com/polkadot-js/common/tree/HEAD/packages/keyring) from 12.6.1 to 12.6.2.
- [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/v12.6.2/packages/keyring)

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

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

package.json

@@ -19,7 +19,7 @@
     "@bull-board/api": "^5.10.0",
     "@bull-board/express": "^5.10.2",
     "@polkadot/api": "^10.11.0",
-    "@polkadot/keyring": "^12.6.1",
+    "@polkadot/keyring": "^12.6.2",
     "@polkadot/util": "^12.5.1",
     "@polkadot/util-crypto": "^12.6.2",
     "@sentry/integrations": "^7.93.0",