chore(deps): bump @polkadot/api from 3.4.1 to 3.6.3 (#377)

Bumps [@polkadot/api](https://github.com/polkadot-js/api) from 3.4.1 to 3.6.3.
- [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)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Zeke Mostov <[email protected]>