Build FFmpeg on pull request

Bump ffmpeg-windows-build-helpers from `990792d` to `a8e823a` #568

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Run time

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Job	Run time
build (win64)	1h 10m 49s
build (win32)	58m 28s
archive (win64)	1m 20s
archive (win32)	1m 19s
release	8s
	2h 12m 4s