Proper event loop setup

[pamelafox]

Purpose

The current code produces a DeprecationWarning in 3.12. This change removes the warning. It looks like this is supported for all our supported versions of Python, per reference at:
https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.get_event_loop

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[X] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Create a 3.12 environment
• Run ./scripts/prepdocs.sh
• Don't see DeprecationWarning