change actions/download-artifact: v2 to v3 #1000

Job	Run time
Build Docker Image (linux/amd64, amd64)	59s
Build Docker Image (linux/arm/v7, armv7)	4m 33s
Build Docker Image (linux/arm64, arm64)	4m 6s
Build Docker Image (linux/arm/v6, armv6)	5m 21s
Test Image (amd64)	30s
Test Image (armv7)	29s
Test Image (arm64)	34s
Test Image (armv6)	31s
Delete failed artifacts (amd64)	9s
Delete failed artifacts (armv7)	4s
Delete failed artifacts (arm64)	2s
Publish Image	0s
Delete failed artifacts (armv6)	3s
Tag Images	0s
Tag Images (Manifest)	0s
Tag images to correct architecture	0s
	17m 21s

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