Update dependency mini-css-extract-plugin to v1

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
mini-css-extract-plugin	devDependencies	major	^1.0.0	source

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Release Notes

webpack-contrib/mini-css-extract-plugin

v1.0.0

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v0.12.0

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v0.11.3

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v0.11.2

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v0.11.1

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