Update dependency postcss to v8.4.49

This MR contains the following updates:

Package	Type	Update	Change
postcss (source)	devDependencies	patch	8.4.47 -> 8.4.49

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Release Notes

postcss/postcss (postcss)

v8.4.49

Compare Source

• Fixed custom syntax without source.offset (by @​romainmenke).

v8.4.48

Compare Source

• Fixed position calculation in error/warnings methods (by @​romainmenke).

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