refactor: replace deprecated datetime.utcnow with datetime.now(timezo…

[Samk13]

❤️ Thank you for your contribution!

Description

• Updated datetime.utcnow() to datetime.now(timezone.utc) following its deprecated since version 3.12.
• See https://docs.python.org/3/library/datetime.html#datetime.datetime.utcnow

Note:

A decision should be made whether to keep naive datetime objects or switch to timezone-aware datetimes.
Using timezone-aware objects like datetime.now(timezone.utc) ensures future compatibility and avoids the upcoming deprecation of datetime.utcnow().
For now, this PR performs a drop-in replacement with datetime.now(timezone.utc).replace(tzinfo=None) to retain compatibility with the existing naive datetime usage,
without altering the current behavior or implementation. Future revisions should consider full timezone awareness for better clarity and accuracy in time handling.

>>> from datetime import datetime, timezone
>>> print(datetime.now(timezone.utc))
2024-10-01 12:25:56.239591+00:00
>>> print(datetime.utcnow())
<stdin>:1: 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).
2024-10-01 12:26:08.612555
>>> print(datetime.now(timezone.utc).replace(tzinfo=None))
2024-10-01 12:27:28.583477

Once approved, we can proceed with updating the remaining packages.

Checklist

Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:

• I'm aware of the code of conduct.
• I've created logical separate commits and followed the commit message format.
• I've added relevant test cases.
• I've added relevant documentation.
• I've marked translation strings.
• I've identified the copyright holder(s) and updated copyright headers for touched files (>15 lines contributions).
• I've NOT included third-party code (copy/pasted source code or new dependencies).
  • If you have added third-party code (copy/pasted or new dependencies), please reach out to an architect.

Frontend

• I've followed the CSS/JS and React guidelines.
• I've followed the web accessibility guidelines.
• I've followed the user interface guidelines.

Reminder

By using GitHub, you have already agreed to the GitHub’s Terms of Service including that:

1. You license your contribution under the same terms as the current repository’s license.
2. You agree that you have the right to license your contribution under the current repository’s license.

[max-moser]

this seems similar to inveniosoftware/invenio-records#323
@utnapischtim told me that there were some issues encountered with jobs/celery tasks with simple replacement of utcnow() calls due to mismatches in the DB[1] - there's a PR open to address this also on a DB level: inveniosoftware/invenio-db#179

i moved it to "to discuss" for now

[1] not sure if that actually also applies here since the tz info gets stripped?

[utnapischtim]

super seeded by #533