Shuffle Stage Random Number Bug

[geke-mir]

What changes are proposed in this pull request?

Cast floats to ints to fix #4051

How is this patch tested? If it is not, please explain why.

Verified that the bug in #4051 has been resolved with updated source. I could not find existing test code for stages.py, would be happy to amend this PR to begin them.

Release Notes

Is this a user-facing change that should be mentioned in the release notes?

• No. You can skip the rest of this section.
• Yes. Give a description of this change to be included in the release
  notes for FiftyOne users.

What areas of FiftyOne does this PR affect?

• App: FiftyOne application changes
• Build: Build and test infrastructure changes
• Core: Core fiftyone Python library changes
• Documentation: FiftyOne documentation changes
• Other

[brimoor]

LGTM

[brimoor]

@geke-mir thanks for fixing this! Must be a breaking change in newer versions of python and/or specifically the random core package (Shuffle()'s implementation hasn't changed in quite awhile)

There are tests that involve the shuffle() stage in https://github.com/voxel51/fiftyone/blob/develop/tests/unittests/view_tests.py, so I think we're all set here.