Replace use of utcnow() with now() for Python 3.13 compatibility, Fixes #1643

[jenstroeger]

Description

Fixes: #1643

Existing tests should cover this change.

Checklist

This pull request is:

• A documentation / typographical error fix
  • Good to go, no issue or tests are needed
• A short code fix
  • please include the issue number, and create an issue if none exists, which
    must include a complete example of the issue. one line code fixes without an
    issue and demonstration will not be accepted.
  • Please include: Fixes: #<issue number> in the commit message
  • please include tests. one line code fixes without tests will not be accepted.
• A new feature implementation
  • please include the issue number, and create an issue if none exists, which must
    include a complete example of how the feature would look.
  • Please include: Fixes: #<issue number> in the commit message
  • please include tests.

[CaselIT]

It seems that the tests are mocking something that needs updating

[jenstroeger]

Ah ok, I’ll take a look. I didn’t find a CONTRIBUTING file so this initial change was a bit of a shot in the dark 🤓

[CaselIT]

no problem, it's what the ci is for!