chore: update dependency postcss to ^8.5.26

[seqeralabs-renovate]

This PR contains the following updates:

Package	Type	Update	Change
postcss (source)	overrides	patch	^8.5.25 → ^8.5.26

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Release Notes

postcss/postcss (postcss)

v8.5.28

Compare Source

• Fixes types regression.

v8.5.27

Compare Source

• Fixed removing any comments starting with /*# (by @​dylanpulver).
• Fixed * hack before a comment in Custom Properties (by @​Jaybhade).
• Fixed empty values in the middle of list.comma() (by @​MahinAnowar).
• Fixed whitespace-only values in list.space() (by @​MahinAnowar).
• Fixed rule’s end position on space before semicolon (by @​maximilliangrand).
• Fixed types (by @​romainmenke).
• Fixed Chinese text in deprecation warning (by @​Jesse205).

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