npm(deps): bump sanity from 3.16.2 to 3.18.0 in /apps/studio

Bumps [sanity](https://github.com/sanity-io/sanity/tree/HEAD/packages/sanity) from 3.16.2 to 3.18.0.
- [Release notes](https://github.com/sanity-io/sanity/releases)
- [Commits](https://github.com/sanity-io/sanity/commits/v3.18.0/packages/sanity)

---
updated-dependencies:
- dependency-name: sanity
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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