Fix date comparisons during coupon activations

[1-Byte]

Fix the following error on Python 3.11:

Traceback (most recent call last):
  File ".venv/bin/lidl-plus", line 8, in <module>
    sys.exit(start())
             ^^^^^^^
  File "lidlplus/__main__.py", line 162, in start
    main()
  File "lidlplus/__main__.py", line 156, in main
    activate_coupons(args)
  File "lidlplus/__main__.py", line 138, in activate_coupons
    if datetime.fromisoformat(coupon["startValidityDate"]) > datetime.now():
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: can't compare offset-naive and offset-aware datetimes

[Andre0512]

Hi, I would prefer to use datetime.utcnow() here. It's a bit shorter and doesn't need the import.

[1-Byte]

Hi, this would not fix the issue because datetime.utcnow() returns a naive datetime (and the comparison would be off). fromisoformat() needs a timezone-aware date to compare against.

[Andre0512]

That's a good point I didn't consider... thank you! 😃