Remove deprecated datetime.datetime.utcfromtimestamp

[07pepa]

This is not a bug but should be addressed and is in source code so i will skip usual i have latest pendulum installed

Issue

pendulum/src/pendulum/__init__.py

Line 295 in 3e3fec6

dt = _datetime.datetime.utcfromtimestamp(timestamp)

_datetime.datetime.utcfromtimestamp has been deprecated since 3.12 see https://docs.python.org/3/library/datetime.html#datetime.datetime.utcfromtimestamp

its replacement is datetime.fromtimestamp and did not see any changes since python 3.6 this is supporting 3.8+ so migration should be easy https://docs.python.org/3/library/datetime.html#datetime.datetime.fromtimestamp

[edgarrmondragon]

This is clearly a duplicate of #830