chore: update dependency postcss to ^8.5.15

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	^8.5.10 → ^8.5.15

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Release Notes

postcss/postcss (postcss)

v8.5.15

Compare Source

• Fixed declaration parsing performance (by @​homanp).

v8.5.14

Compare Source

• Fixed custom syntax regression (by @​43081j).

v8.5.13

Compare Source

• Fixed postcss-scss commend regression.

v8.5.12

Compare Source

• Fixed reading any file via user-generated CSS.
• Added opts.unsafeMap to disable checks.

v8.5.11

Compare Source

• Fixed nested brackets parsing performance (by @​offset).

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