Update dependency postcss to v8.3.11

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	^8.3.5 -> 8.3.11

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Release Notes

postcss/postcss

v8.3.11

Compare Source

• Remove debugging code.

v8.3.10

Compare Source

• Fixed Maximum call stack issue of some source maps (by Yeting Li).

v8.3.9

Compare Source

• Replaced nanocolors to picocolors.
• Reduced package size.

v8.3.8

Compare Source

• Update nanocolors.

v8.3.7

Compare Source

• Replaced colorette to nanocolors.
• Added bug field to package.json (by Christian Oliff).
• Improved docs (by Andrew Bruce and Paul Shryock).

v8.3.6

Compare Source

• Fixed column in missed semicolon error (by @​Gusted).

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