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remove dependency on "FakeFSHelpers", accept newer version of css_inline #111

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Run time

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Job	Run time
tests (3.6)	19s
tests (3.7)	21s
tests (3.8)	17s
tests (3.9)	23s
tests (3.10)	18s
tests (3.11)	17s
tests (3.12)	15s
tests (pypy-3.8)	40s
tests (pypy-3.9)	37s
	3m 27s