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

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

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