Bump polkadot-api from 1.20.4 to 1.20.5

Bumps [polkadot-api](https://github.com/polkadot-api/polkadot-api) from 1.20.4 to 1.20.5.
- [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-version: 1.20.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package.json

@@ -39,7 +39,7 @@
     "copy-to-clipboard": "^3.3.3",
     "lucide-react": "^0.553.0",
     "next-themes": "^0.4.6",
-    "polkadot-api": "^1.20.4",
+    "polkadot-api": "^1.20.5",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
     "react-icons": "^5.5.0",