Bump golang.org/x/sync from 0.2.0 to 0.3.0

Bumps golang.org/x/sync from 0.2.0 to 0.3.0.

Commits

93782cc errgroup: use WithCancelCause to cancel context
4966af6 singleflight: example for using Group
a6666c1 go.mod: upgrade to go 1.17
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Sora233 / DDBOT

Bump golang.org/x/sync from 0.2.0 to 0.3.0 #239