Update dependency postcss to v8.4.7

This MR contains the following updates:

Package	Type	Update	Change
postcss (source)	devDependencies	patch	8.4.6 -> 8.4.7

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Release Notes

postcss/postcss

v8.4.7

Compare Source

• Fixed Node#warn() type (by Masafumi Koba).
• Fixed comment removal in values after ,.

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