Update dependency postcss-css-variables to v0.19.0

This MR contains the following updates:

Package	Type	Update	Change
postcss-css-variables	devDependencies	minor	0.18.0 -> 0.19.0

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Release Notes

MadLittleMods/postcss-css-variables (postcss-css-variables)

v0.19.0

Compare Source

• Fix nesting edge case with comma separated selectors
  • Thank you to @​marapper for the contribution

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