[Snyk] Upgrade @sanity/core from 2.1.2 to 2.10.2

[snyk-bot]

Snyk has created this PR to upgrade @sanity/core from 2.1.2 to 2.10.2.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 41 versions ahead of your current version.
• The recommended version was released a month ago, on 2021-05-03.

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