Pytest 9 CI issues

[esoteric-ephemera]

• Mostly superseded by #558 In pytest==9.0, raising a unitest.SkipTest no longer allows a test to be skipped, but marks the test as failed, see issue here. Adding workarounds so that fireworks doesn't rely on older pytest versions + should still work with just unittest architecture
• Remove deprecated utcnow in favor of recommended and more verbose datetime.datetime.now(datetime.timezone.utc)
• Bump some test versions to test realistic behavior

[esoteric-ephemera]

Guess you beat me to it @janosh haha! Not sure the syntax for createUser / dropUser changed, or if the pymongo docs are out of date. The fireworks syntax matches the pymongo docs

Still some fixes that will be relevant as time goes on here, @computron,