Update cloudpickle to 0.8.0.dev0

[pcmoritz]

This updates cloudpickle to 0.8.0.dev0, specifically cloudpipe/cloudpickle#245 with the fix cloudpipe/cloudpickle#240 applied.

We should hold off merging this till cloudpipe/cloudpickle#240 is merged.

This should fix the dataclass serialization problem in #3917

cc @suquark

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[pcmoritz]

Looks like this is working now, nice!

[robertnishihara]

@pcmoritz is this ready to review? Or are there any more anticipated changes?

[pcmoritz]

@robertnishihara This is ready.

[robertnishihara]

I'll merge this once once it corresponds to an actual cloudpickle commit. Looks like the relevant PR still hasn't been merged in cloudpickle.

[robertnishihara]

Just updated cloudpickle to correspond to cloudpipe/cloudpickle@9184a67.

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[robertnishihara]

Jenkins, retest this please.

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[robertnishihara]

Jenkins, retest this please.

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