Update dependency postcss to v8.4.23

This MR contains the following updates:

Package	Type	Update	Change
postcss (source)	devDependencies	patch	8.4.20 -> 8.4.23

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Release Notes

postcss/postcss

v8.4.23

Compare Source

• Fixed warnings in TypeDoc.

v8.4.22

Compare Source

• Fixed TypeScript support with node16 (by Remco Haszing).

v8.4.21

Compare Source

• Fixed Input#error types (by Aleks Hudochenkov).

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