Bump candid from 0.9.7 to 0.9.8

Bumps [candid](https://github.com/dfinity/candid) from 0.9.7 to 0.9.8.
- [Release notes](https://github.com/dfinity/candid/releases)
- [Changelog](https://github.com/dfinity/candid/blob/master/Changelog.md)
- [Commits](https://github.com/dfinity/candid/commits)

---
updated-dependencies:
- dependency-name: candid
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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