Bump postcss from 8.4.27 to 8.4.31 in /frontend

[dependabot]

Bumps postcss from 8.4.27 to 8.4.31.

Release notes

Sourced from postcss's releases.

8.4.31

• Fixed \r parsing to fix CVE-2023-44270.

8.4.30

• Improved source map performance (by @​romainmenke).

8.4.29

• Fixed Node#source.offset (by @​idoros).
• Fixed docs (by @​coliff).

8.4.28

• Fixed Root.source.end for better source map (by @​romainmenke).
• Fixed Result.root types when process() has no parser.

Changelog

Sourced from postcss's changelog.

8.4.31

• Fixed \r parsing to fix CVE-2023-44270.

8.4.30

• Improved source map performance (by Romain Menke).

8.4.29

• Fixed Node#source.offset (by Ido Rosenthal).
• Fixed docs (by Christian Oliff).

8.4.28

• Fixed Root.source.end for better source map (by Romain Menke).
• Fixed Result.root types when process() has no parser.

Commits

• 90208de Release 8.4.31 version
• 58cc860 Fix carrier return parsing
• 4fff8e4 Improve pnpm test output
• cd43ed1 Update dependencies
• caa916b Update dependencies
• 8972f76 Typo
• 11a5286 Typo
• 45c5501 Release 8.4.30 version
• bc3c341 Update linter
• b2be58a Merge pull request #1881 from romainmenke/improve-sourcemap-performance--phil...
• Additional commits viewable in compare view

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[andrewtavis]

Will merge this and see that it builds properly when brought down locally.