shadowmire.py: update to taoky/shadowmire@1856a97e2d407502516de89d070… #302

Job	Run time
multi (bandersnatch)	1m 52s
multi (ftpsync)	1m 50s
multi (nix-channels)	5m 25s
multi (pub-mirror)	4m 5s
multi (rustup-mirror)	19m 29s
multi (shadowmire)	56s
multi (tsumugu)	43m 19s
multi (tunasync-scripts, .)	7m 48s
multi (rubygems-mirror, dockerfiles/rubygems)	10m 59s
	1h 35m 43s

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