Updated version of download action in gh workflows. #78

Job	Run time
build-docker-images (sipsorcery)	5s
build-docker-images (sipsorcery)	21s
build-docker-images (sipsorcery)	31s
build-docker-images (aiortc)	2s
build-docker-images (aiortc)	36s
build-docker-images (aiortc)	1m 14s
build-docker-images (werift)	2s
build-docker-images (werift)	37s
build-docker-images (werift)	1m 7s
build-docker-images (pion)	4s
build-docker-images (pion)	35s
build-docker-images (pion)	54s
build-docker-images (libdatachannel)	15s
build-docker-images (libdatachannel)	35s
build-docker-images (libdatachannel)	1m 11s
build-docker-images (webrtc-rs)	2s
build-docker-images (webrtc-rs)	36s
build-docker-images (webrtc-rs)	57s
interop-tests	0s
interop-tests	0s
interop-tests	0s
collate	0s
collate	0s
collate	0s
	9m 44s

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