css, webpack-plugin: Replace chalk dependency with picocolors

[askoufis]

Fixes #756.

chalk is overkill for our use case. picocolors is very small and simple, and has a browser bundle.

[changeset-bot]

🦋 Changeset detected

Latest commit: efb80a8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 19 packages

Name	Type
@vanilla-extract/webpack-plugin	Patch
@vanilla-extract/css	Patch
@vanilla-extract-private/test-helpers	Patch
@fixtures/next-app-router	Patch
@fixtures/next-pages-router	Patch
@fixtures/features	Patch
@fixtures/layers	Patch
@fixtures/low-level	Patch
@fixtures/recipes	Patch
@fixtures/sprinkles	Patch
@fixtures/template-string-paths	Patch
@fixtures/themed	Patch
@fixtures/thirdparty	Patch
@fixtures/unused-modules	Patch
@fixtures/thirdparty-dep	Patch
@fixtures/thirdparty-dep-dep	Patch
vanilla-extract-example-remix	Patch
vanilla-extract-example-webpack-react	Patch
@vanilla-extract-private/tests	Patch

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