Bump @polkadot/api from 7.10.1 to 7.12.1

Bumps [@polkadot/api](https://github.com/polkadot-js/api/tree/HEAD/packages/api) from 7.10.1 to 7.12.1.
- [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/v7.12.1/packages/api)

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

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

package.json

@@ -20,7 +20,7 @@
     "start": "node ./dist/index.js start"
   },
   "dependencies": {
-    "@polkadot/api": "^7.10.1",
+    "@polkadot/api": "^7.12.1",
     "@w3f/config": "^0.1.1",
     "@w3f/logger": "^0.4.2",
     "commander": "^4.0.0",