Avoid usage of deprecated `datetime.datetime.utcfromtimestamp` in `pendulum.from_timestamp`

[Taragolis]

Pull Request Check List

• [x] Added tests for changed code.
• [x] Updated documentation for changed code.

datetime.datetime.utcfromtimestamp() is deprecated into the Python 3.12 as result current implementation raise warning message

/usr/local/lib/python3.12/site-packages/pendulum/__init__.py:295 DeprecationWarning: datetime.datetime.utcfromtimestamp() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC:

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #803 will not alter performance

_{Comparing Taragolis:remove-deprecated-from-python-stdlib (aac69cc) with master (3e3fec6)}

Summary

✅ 1 untouched benchmarks