Raise gRPC version floor to 1.6 and use new context bridge API #2948
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This raises the gRPC minimum version just a little bit (still 4+ years old) and uses a newly introduced context storage API that can return a value, removing the need for the side queues. Should improve performance nicely, and unfortunately I haven't been able to reproduce the issues in #2564 but by controlling the return value which gets passed back to us more directly, I think it does fix a corner case where the reference gets changed (I can't think of a reason the app wouldn't start because it would have been a harmless log message still though FWIU). The decoupling of
current()
andStorage.attach()
in <=1.5 would allow them to be out of sync