development-dependency: bump postcss from 8.3.6 to 8.3.7

Bumps postcss from 8.3.6 to 8.3.7.

Release notes

Sourced from postcss's releases.

8.3.7

• Replaced colorette to nanocolors.
• Added bug field to package.json (by @​coliff).
• Improved docs (by @​camelpunch and @​paulshryock).

Changelog

Sourced from postcss's changelog.

8.3.7

• Replaced colorette to nanocolors.
• Added bug field to package.json (by Christian Oliff).
• Improved docs (by Andrew Bruce and Paul Shryock).

Commits

• d6a194d Release 8.3.7 version
• acabfd3 Update dependencies
• a482e70 Replace colorette to nanocolors
• b15781c Merge pull request #1634 from postcss/dependabot/npm_and_yarn/nth-check-2.0.1
• 0b74a01 Bump nth-check from 2.0.0 to 2.0.1
• 6a659f3 Merge pull request #1633 from postcss/dependabot/npm_and_yarn/tmpl-1.0.5
• b7da9ea Bump tmpl from 1.0.4 to 1.0.5
• 75966a9 Merge pull request #1626 from camelpunch/patch-1
• 2e27259 Community fixes error in English :)
• 3a590ae Update dependencies
• Additional commits viewable in compare view