Vendor cloudpickle 3.0.0 and drop support for Python 3.7. #1515
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cloudpickle does no longer support Python 3.7 (released more than 5 years ago and no longer supported by the CPython team) so we could bump up the dependency.
Note we should bump up the other Python deps on the CI to also test with recent versions of Python 3.12, numpy, dask and such but we should probably do that in a dedicated PR.