chore(deps): update dependency postcss-calc to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-calc	6.0.2 -> 8.0.0

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Release Notes

postcss/postcss-calc

v8.0.0

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• Breaking: Updated PostCSS from v7.x to v8.x (#​125)

v7.0.5

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• Fixed: reduction

v7.0.4

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• Fixed: strips away important factors from multiplications in calc() (#​107)

v7.0.3

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• Fixed: substracted css-variable from zero (#​111)

v7.0.2

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• Fixed: incorrect reduction of subtraction from zero (#​88)
• Fixed: doesn't remove calc for single function
• Fixed: relax parser on unknown units (#​76)
• Fixed: handle numbers with exponen composed (#​83)
• Fixed: handle plus sign before value (#​79)
• Fixed: better handle precision for nested calc (#​75)
• Fixed: properly handle nested add and sub expression inside sub expression (#​64)
• Fixed: handle uppercase units and functions (#​71)
• Fixed: do not break calc with single var (cssnano/cssnano#​725)
• Updated: postcss to 7.0.27 (patch)
• Updated: postcss-selector-parser to 6.0.2
• Updated: postcss-value-parser to 4.0.2

v7.0.1

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• Updated: postcss to 7.0.2 (patch)
• Updated: postcss-selector-parser to 5.0.0-rc.4 (patch)
• Updated: postcss-value-parser to 3.3.1 (patch)

v7.0.0

Compare Source

• Changed: Updated postcss-selector-parser to version 5.0.0-rc.3
• Changed: Dropped reduce-css-calc as a dependency
• Fixed: Support constant() and env() (#​42, #​48)
• Fixed: Support custom properties with "calc" in its name (#​50)
• Fixed: Remove unnecessary whitespace around * and / (cssnano#​625)
• Fixed: Arithmetic bugs around subtraction (#​49)
• Fixed: Handling of nested calc statements (reduce-css-calc#​49)
• Fixed: Bugs regarding complex calculations (reduce-cs-calc#​45)
• Fixed: 100% incorrectly being transformed to 1 (reduce-css-calc#​44)
• Added: support for case-insensitive calc statements

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