Import ABC from collections.abc for Python 3.10 compatibility.

[tirkarthi]

What does this do and why?

Import ABC from collections.abc for Python 3.10 compatibility. Using collections was deprecated and removed in Python 3.10 . This PR is compatible with Python 3.6 and above but incompatible with Python 2.

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Testing

• If these changes added new functionality, I tested them against the live API with real auth
• I wrote tests covering these changes

• Tests pass in the GitHub Actions CI for the following Python versions:

• 3.6
• 3.7
• 3.8
• 3.9

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[aschuman0]

Thank you for the PR @tirkarthi ! We're working on python 3.10 compatibility for the next release. We'll get this rolled in at that time.