Update dependency postcss to v8.2.6

This MR contains the following updates:

Package	Type	Update	Change
postcss (source)	devDependencies	patch	8.2.4 -> 8.2.6

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Release Notes

postcss/postcss

v8.2.6

Compare Source

• Fixed Maximum call stack size exceeded in Node#toJSON.
• Fixed docs (by inokawa).

v8.2.5

Compare Source

• Fixed escaped characters handling in list.split (by Natalie Weizenbaum).

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