[Snyk] Upgrade mini-css-extract-plugin from 0.9.0 to 1.3.9#7

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snyk-bot wants to merge 1 commit intomainfrom snyk-upgrade-3dae397ea0d1669fd5945d954ac1d741

+34-54

Commits on Apr 4, 2021

feat: upgrade mini-css-extract-plugin from 0.9.0 to 1.3.9
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