Update dependency css-extract to v2

This PR contains the following updates:

Package	Change	Age	Confidence
css-extract	1.3.1 → 2.0.0

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Release Notes

stackcss/css-extract (css-extract)

v2.0.0

Compare Source

• Update dependencies. (@​goto-bus-stop in #​16)
• Add test for insertCss(someDynamicValue). (@​ahdinosaur in #​12)

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