Update devhub/latest
from Substrate upstream polkadot-v0.9.15-1
#300
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Changes from Substrate upstream
polkadot-v0.9.15-1
Use 1 line deps
use
devhub/latest
tag for depsUse ONLY 4.0.0-dev deps for sp-core and sp-std and sp-runtime (upstream master is ahead)
Confirmed to build and run on Ubuntu 20.04 LTS with
latest
tag to this once merged