Bump @polkadot/api from 9.2.4 to 9.4.2 (#92)

Bumps [@polkadot/api](https://github.com/polkadot-js/api/tree/HEAD/packages/api) from 9.2.4 to 9.4.2.
- [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/v9.4.2/packages/api)

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

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

package.json

@@ -25,7 +25,7 @@
     "start": "ts-node src/index.ts"
   },
   "dependencies": {
-    "@polkadot/api": "^9.2.4",
+    "@polkadot/api": "^9.4.2",
     "@polkadot/keyring": "^8.4.1",
     "@polkadot/util": "^8.4.1",
     "@polkadot/util-crypto": "^8.4.1",