[Snyk] Upgrade mini-css-extract-plugin from 0.9.0 to 0.12.0#5

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snyk-bot wants to merge 1 commit intomainfrom snyk-upgrade-824ac05454cda57e964b861db8b1ffec

+4-4

Commits on Nov 11, 2020

fix: upgrade mini-css-extract-plugin from 0.9.0 to 0.12.0
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