python3 datetime utcnow deprecation breaks python 3.6 (used on rh8 & ubuntu 18)

[petersilva]

When I run pytest, I get deprecation warnings like so:

...

sarracenia/transfer/s3_test.py: 80 warnings
  /usr/lib/python3/dist-packages/botocore/auth.py:419: DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC).
    datetime_now = datetime.datetime.utcnow()

For telnet, there is no replacement.
If I start up ubuntu 18.04 vm,... which runs python3.6.9 ... and I try:

ubuntu@canny-tick:~$ python3
Python 3.6.9 (default, Mar 10 2023, 16:46:00) 
[GCC 8.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import datetime
>>> datetime.datetime.now()
datetime.datetime(2025, 2, 21, 12, 31, 17, 691660)
>>> datetime.datetime.now(datetime.UTC)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'datetime' has no attribute 'UTC'
>>>

so the old code will soon be deprecated, but the new code will not run
on older systems.

[andreleblanc11]

You can use datetime.datetime.now(datetime.timezone.utc) as an alternative

root@u1804-server:~# python3
Python 3.6.9 (default, Apr 11 2024, 09:35:16)
[GCC 8.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import datetime
>>> datetime.datetime.now(datetime.timezone.utc) ; datetime.datetime.utcnow()
datetime.datetime(2025, 2, 21, 18, 26, 14, 751271, tzinfo=datetime.timezone.utc)
datetime.datetime(2025, 2, 21, 18, 26, 14, 751307)