Bump postcss from 8.1.4 to 8.1.8

[dependabot-preview[bot]]

Bumps postcss from 8.1.4 to 8.1.8.

Release notes

Sourced from postcss's releases.

8.1.7

• Fix import support in TypeScript (by @remcohaszing).

8.1.6

• Reverted package.exports Node.js 15 fix.

8.1.5

• Fixed Node.js 15 warning (by @ShenHongFei).

Changelog

Sourced from postcss's changelog.

8.1.8

• Fix LazyResult type compatibility with Promise (by Ludovico Fischer).
• Use HTTPS links in documentation.

8.1.7

• Fix import support in TypeScript (by Remco Haszing).

8.1.6

• Reverted package.exports Node.js 15 fix.

8.1.5

• Fixed Node.js 15 warning (by 沈鸿飞).

Commits

• 6d2d1fb Release 8.1.8 version
• 875283a Update dependencies
• fb70ca9 Clean up tests
• 0d89106 Merge pull request #1463 from ludofischer/fix-lazyresult-type
• 362ac8d fix(typescript): ensure LazyResult complies with Promise interface.
• f8fe285 Update dependencies
• 6577de1 Fix dead links
• 901014c Use HTTPS links
• 6599e97 Update dependencies
• 7e68b54 Release 8.1.7 version
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #150.