bump(deps): update dependency postcss to v8.4.31

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.4.30 -> 8.4.31

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Release Notes

postcss/postcss (postcss)

v8.4.31

Compare Source

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

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[codecov]

Codecov Report

Merging #626 (a880f6d) into main (0551e1b) will increase coverage by 6.32%.
Report is 67 commits behind head on main.
The diff coverage is 96.74%.

@@            Coverage Diff             @@
##             main     #626      +/-   ##
==========================================
+ Coverage   85.00%   91.32%   +6.32%     
==========================================
  Files          10       13       +3     
  Lines         420      519      +99     
  Branches       73      100      +27     
==========================================
+ Hits          357      474     +117     
+ Misses         63       45      -18     

Files	Coverage Δ
...ented-pipeline-jest-md/src/JestMarkdownPipeline.ts	100.00% <100.00%> (ø)
...ages/contented-pipeline-md/src/MarkdownPipeline.ts	85.29% <100.00%> (ø)
...ages/contented-pipeline-md/src/UnifiedProcessor.ts	87.09% <100.00%> (-0.41%)	⬇️
...contented-pipeline-md/src/plugins/RehypeHeading.ts	93.54% <ø> (+6.45%)	⬆️
...contented-pipeline-md/src/plugins/RehypeMermaid.ts	93.75% <ø> (+50.00%)	⬆️
...ntented-pipeline-md/src/plugins/RemarkCodeblock.ts	100.00% <100.00%> (ø)
...d-pipeline-md/src/plugins/RemarkDirectiveRehype.ts	100.00% <100.00%> (ø)
...es/contented-pipeline-md/src/plugins/RemarkLink.ts	100.00% <100.00%> (+28.57%)	⬆️
...ages/contented-processor/src/ContentedProcessor.ts	88.46% <100.00%> (+2.04%)	⬆️
...s/contented-pipeline-md/src/plugins/RehypeShiki.ts	96.77% <96.77%> (ø)
... and 2 more