chore: update dependency mini-css-extract-plugin to v2.9.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mini-css-extract-plugin	2.9.2 -> 2.9.4

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Release Notes

webpack-contrib/mini-css-extract-plugin (mini-css-extract-plugin)

v2.9.4

Compare Source

v2.9.3

Compare Source

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