Resolve dask_cudf failures caused by upstream groupby changes

[rjzamora]

Description

The sort=True default change in dask/dask#9486 was not meant to propagate to the DataFrameGroupby and SeriesGroupby classes just yet. This PR adds the necessary sort=None defaults needed to avoid CI failures.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

cc @galipremsagar

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (branch-22.10@451c837). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

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[galipremsagar]

@gpucibot merge