Update dependency postcss-preset-env to v6.7.2

This MR contains the following updates:

Package	Type	Update	Change
postcss-preset-env (source)	devDependencies	patch	6.7.0 -> 6.7.2

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Release Notes

csstools/postcss-plugins (postcss-preset-env)

v6.7.2

Compare Source

v6.7.1

Compare Source

February 13, 2022

• Added notice when using preset-env with PostCSS > 7 to prompt to upgrade.

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