Bump polkadot-api from 1.3.3 to 1.6.7

Bumps [polkadot-api](https://github.com/polkadot-api/polkadot-api) from 1.3.3 to 1.6.7.
- [Release notes](https://github.com/polkadot-api/polkadot-api/releases)
- [Changelog](https://github.com/polkadot-api/polkadot-api/blob/main/NEWS.md)
- [Commits](https://github.com/polkadot-api/polkadot-api/commits)

---
updated-dependencies:
- dependency-name: polkadot-api
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -42,7 +42,7 @@
     "dot-connect": "^0.10.0",
     "lucide-react": "^0.446.0",
     "next-themes": "^0.3.0",
-    "polkadot-api": "^1.3.3",
+    "polkadot-api": "^1.6.7",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-icons": "^5.3.0",