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

[Samk13]

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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.

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