[issue23332] datetime.isoformat() -> explicitly mark UTC string as such

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

> When using utcnow() e.g. I would expect the result definitely being marked as UTC.

Don't use utcnow().  This is a leftover from the times when there was no timezone support in datetime.

The documentation for utcnow [1] already points you in the right direction, but we can consider formally deprecating it together with utcfromtimestamp.

[1] https://docs.python.org/3/library/datetime.html#datetime.datetime.utcnow

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