Update dependency mini-css-extract-plugin to v2.7.6

This MR contains the following updates:

Package	Type	Update	Change
mini-css-extract-plugin	dependencies	patch	2.7.0 -> 2.7.6

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Release Notes

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

v2.7.6

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v2.7.5

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v2.7.4

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v2.7.3

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v2.7.2

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v2.7.1

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