Update autoprefixer-rails requirement from ~> 9.7 to ~> 10.0

[dependabot-preview]

Updates the requirements on autoprefixer-rails to permit the latest version.

Changelog

Sourced from autoprefixer-rails's changelog.

Change Log

10.0 “Alis volat propriis”

• Removed support for Node.js 6.x, 8.x, 11.x.
• Moved to PostCSS 8.

9.8.6.5

• Fix 9.8.6.4 regression.

9.8.6.4

• Remove deprecation warnings.

9.8.6.3

• Fix deprecation warning for non-Rails environment.

9.8.6.2

• Print deprecation warning only once.

9.8.6.1

• Improve deprecated warnings.

9.8.6

• Fixed env option.
• Added deprecation warning.

9.8.5

• Improved Grid Layout warnings (by Daniel Tonon).

9.8.4

• Reduce JS bundle size.

9.8.3

• Update Can I Use data.

9.8.2

• Update Can I Use data.

9.8.1

• Replace chalk to kleur (by Luke Edwards).

9.8 “Vigilo Confido”

• Add :placeholder-shown support (by Tanguy Krotoff).

9.7.6

• Revert -webkit-stretch fix.

9.7.5

• Fix -webkit-stretch support.
• Reduce gem file size.

Commits

• 4b7714a Release 10.0 version
• 177007d Return autoprefixer.js and Processor from Autoprefixer 10 branch
• c5c8434 Release 9.8.6.5 version
• d2bfb50 Temporary revert Processor changes
• abd48f3 Update Autoprefixer and PostCSS in build/
• 9cff907 Revert autoprefixer.js
• b4d81b9 Release 9.8.6.4 version
• 9306d3e Remove deprecation warnings. (#177)
• f1042be build: use rollup to build vendor/autoprefixer.js (#176)
• 6800e4f Release 9.8.6.3 version
• Additional commits viewable in compare view

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