bot: Bump postcss from 8.4.27 to 8.4.31 in /playground

[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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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (d8466cf) 74.67% compared to head (235af8c) 74.66%.

@@             Coverage Diff             @@
##           develop    #1930      +/-   ##
===========================================
- Coverage    74.67%   74.66%   -0.01%     
===========================================
  Files          234      234              
  Lines        23114    23114              
===========================================
- Hits         17260    17257       -3     
- Misses        4673     4675       +2     
- Partials      1181     1182       +1     

Flag	Coverage Δ
all-tests	74.66% <ø> (-0.01%)	⬇️

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see 3 files with indirect coverage changes

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[dependabot]

Looks like postcss is up-to-date now, so this is no longer needed.