Update datetime module as datetime.datetime.utcfromtimestamp() is deprecated

[roboes]

This pull request addresses the deprecation warning related to datetime.datetime.utcfromtimestamp(), which is scheduled for removal in a future version of Python. The utcfromtimestamp() method is replaced with datetime.datetime.fromtimestamp() using datetime.timezone.utc to ensure that the datetime objects are timezone-aware and comply with the updated recommendations in Python's documentation.