Bump @open-rpc/generator from 1.18.6 to 1.22.3

Bumps [@open-rpc/generator](https://github.com/open-rpc/generator) from 1.18.6 to 1.22.3.
- [Release notes](https://github.com/open-rpc/generator/releases)
- [Changelog](https://github.com/open-rpc/generator/blob/master/CHANGELOG.md)
- [Commits](open-rpc/generator@1.18.6...1.22.3)

---
updated-dependencies:
- dependency-name: "@open-rpc/generator"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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