Avoid use of the deprectated utcnow datetime method

[pfmoore]

No description provided.

[notatallshaw]

How come this PRs over #12006 ?

Also is current_time = datetime.datetime.now(datetime.timezone(datetime.timedelta(0))) really a recommended way to do this? I assumed the correct way is current_time = datetime.datetime.now(datetime.timezone.utc)?

Edit: I think you've answered my questions in #12005 (comment)

[pfmoore]

My bad, I didn't see #12006 before I put this together. And yes, datetime.timezone.utc is much better, I just wasn't aware of it.