[Snyk] Security upgrade gatsby-plugin-mdx from 3.20.0 to 4.0.0#55

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hikerpig wants to merge 1 commit intomasterfrom snyk-fix-28e4c22bc5e2810b5bea9e5593b098d3

+1-1

Commits on Aug 16, 2022

fix: packages/gatsby-theme-kb/package.json to reduce vulnerabilities
snyk-bot
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