chore(deps): update dependency postcss to v8.5.26

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postcss (source)	8.5.15 → 8.5.26

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Release Notes

postcss/postcss (postcss)

v8.5.26

Compare Source

• Fixed list.split() regression (by @​lazerg).
• Track symlinks in path protection in source map loading (by @​drengir1).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.13%. Comparing base (36985d9) to head (2932c06).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #222   +/-   ##
=======================================
  Coverage   94.13%   94.13%           
=======================================
  Files          10       10           
  Lines         290      290           
  Branches      105      105           
=======================================
  Hits          273      273           
  Misses          1        1           
  Partials       16       16           

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[timoa]

patch-level dep bump (postcss 8.5.15 → 8.5.26) with all checks green; only package.json changed; CodeQL, dependency-review, lint/test/build/security, E2E, codecov all SUCCESS. Safe to auto-merge.