Bump @polkadot/api from 10.12.4 to 10.12.6 (#5754)

Bumps [@polkadot/api](https://github.com/polkadot-js/api/tree/HEAD/packages/api) from 10.12.4 to 10.12.6.
- [Release notes](https://github.com/polkadot-js/api/releases)
- [Changelog](https://github.com/polkadot-js/api/blob/master/CHANGELOG.md)
- [Commits](https://github.com/polkadot-js/api/commits/v10.12.6/packages/api)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -44,7 +44,7 @@
     "@docusaurus/plugin-client-redirects": "^2.4.3",
     "@docusaurus/preset-classic": "^2.4.3",
     "@octokit/rest": "^20.0.2",
-    "@polkadot/api": "^10.12.4",
+    "@polkadot/api": "^10.12.6",
     "@testing-library/jest-dom": "^6.4.2",
     "@testing-library/react": "^12.0.4",
     "axios": "^1.6.8",