[Snyk] Security upgrade highlight.js from 9.13.1 to 10.4.1#45

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snyk-fix-8c0cefcb1f7bdf468f6dff5f079b99e8

Commits on Dec 7, 2020

fix: extensions/markdown-language-features/package.json & extensions/markdown-language-features/yarn.lock to reduce vulnerabilities
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