Remove calls to datetime utcnow/utcfromtimestamp
These calls don't do what you think and are deprecated in Python 3.12. The preferred way is
http_to_keep does have a function that takes a
utcnow argument, the value can be updated but not sure what we're going to do about the name. This was added relatively recently so we could maybe get away with a rename if we do it soon.
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