build: update @sanity/color dependency

[mariuslundgard]

Description

• This change updates @sanity/color from 1.0.0 to 2.0.15 in @sanity/base (required updating code in the user color manager + form validation component).
• This change adds @sanity/color as dependency where it was missing.

What to review

• The studio builds and runs using the new version of @sanity/color.
• Look especially at presence avatars (if the studio doesn’t crash when rendering user avatars, it works)

[vercel]

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test-studio – ./

🔍 Inspect: https://vercel.com/sanity-io/test-studio/BRDhXavrpRYTgSSPLxgbejiHK3YW
✅ Preview: https://test-studio-git-chore-ch8298update-sanity-color-dependency.sanity.build

perf-studio – ./

🔍 Inspect: https://vercel.com/sanity-io/perf-studio/5vJtrUCGKBePGrE6PqLZB7VYLUDc
✅ Preview: https://perf-studio-git-chore-ch8298update-sanity-color-dependency.sanity.build

[bjoerge]

🎉💯