net

Bump actions/download-artifact from 3 to 4 #209

# to view logs

Job	Run time
ubuntu-latest - tokio - tls	7m 1s
ubuntu-latest - tokio - native-tls	7m 7s
ubuntu-latest - tokio - tcp	4m 18s
ubuntu-latest - async-std - tls	7m 27s
ubuntu-latest - async-std - native-tls	7m 25s
ubuntu-latest - async-std - tcp	4m 14s
ubuntu-latest - smol - tls	6m 57s
ubuntu-latest - smol - tcp	4m 5s
	48m 34s

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