[Snyk] Security upgrade simple-git from 2.48.0 to 3.15.0#28

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-1e67a570ac1795cd971779b1372236e3

+1-1

Commits on Dec 6, 2022

fix: packages/netlify-cms-proxy-server/package.json to reduce vulnerabilities
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