BUGFIX: Remove type onp.bool.

[abdullahselek]

I have to built mxnet locally on my M1 machine and then installed. But when I import the lib it threw AttributeError error with message module 'numpy' has no attribute 'bool'. This PR is a fix for the deprecation issue.

Description

Remove type onp.bool as np.bool was a deprecated alias for the builtin bool with numpy version 1.20.

Checklist

Essentials

• PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• Changes are complete (i.e. I finished coding on this PR)
• [] All changes have test coverage
• Code is well-documented

Changes

• Feature1, tests, (and when applicable, API doc)
• Feature2, tests, (and when applicable, API doc)

Comments

• If this change is a backward incompatible change, why must this change be made.
• Interesting edge cases to note here

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