chore(deps): bump sp-npos-elections from 29.0.0 to 30.0.0

Bumps [sp-npos-elections](https://github.com/paritytech/polkadot-sdk) from 29.0.0 to 30.0.0.
- [Release notes](https://github.com/paritytech/polkadot-sdk/releases)
- [Changelog](https://github.com/paritytech/polkadot-sdk/blob/master/docs/RELEASE.md)
- [Commits](https://github.com/paritytech/polkadot-sdk/commits)

---
updated-dependencies:
- dependency-name: sp-npos-elections
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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