[Security] Bump postcss from 8.4.27 to 8.4.31 in /frontend

Bumps postcss from 8.4.27 to 8.4.31. This update includes a security fix.

Vulnerabilities fixed

PostCSS line return parsing error An issue was discovered in PostCSS before 8.4.31. It affects linters using PostCSS to parse external Cascading Style Sheets (CSS). There may be \r discrepancies, as demonstrated by @font-face{ font:(\r/*);} in a rule.

Patched versions: 8.4.31 Affected versions: < 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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