[Snyk] Security upgrade mkdirp from 0.5.1 to 1.0.0#5

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snyk-fix-ec1fd7d1a2b4558760d006dd54639434

Commits on Mar 12, 2020

fix: DevSkim-VSCode-Plugin/server/package.json & DevSkim-VSCode-Plugin/server/package-lock.json to reduce vulnerabilities
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