build(deps-dev): bump @polkadot/typegen from 14.3.1 to 15.0.1 (#1439)

Bumps [@polkadot/typegen](https://github.com/polkadot-js/api/tree/HEAD/packages/typegen) from 14.3.1 to 15.0.1.
- [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/v15.0.1/packages/typegen)

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

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

package.json

@@ -54,7 +54,7 @@
     "web3-validator": "^2.0.6"
   },
   "devDependencies": {
-    "@polkadot/typegen": "^14.3.1",
+    "@polkadot/typegen": "^15.0.1",
     "@subsquid/substrate-metadata-explorer": "^3.1.2",
     "@subsquid/substrate-typegen": "^8.0.2",
     "@subsquid/typeorm-codegen": "^2.0.2",