Update dependency mini-css-extract-plugin to v2.6.0

This MR contains the following updates:

Package	Type	Update	Change
mini-css-extract-plugin	dependencies	minor	2.5.3 -> 2.6.0

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Release Notes

webpack-contrib/mini-css-extract-plugin

v2.6.0

Compare Source

Features

• added baseUri option support (from entry options) (#​915) (6004d95)

2.5.3 (2022-01-25)

Bug Fixes

• types (#​903) (6650691)

2.5.2 (2022-01-17)

Bug Fixes

• types (dfb9afd)

2.5.1 (2022-01-17)

Bug Fixes

• cjs export and types (e836a00)

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