Replace datetime.utcfromtimestamp

[cdce8p]

Describe what the PR does: Starting with Python 3.12 datetime.utcfromtimestamp will be deprecated. https://docs.python.org/3.12/library/datetime.html#datetime.datetime.utcfromtimestamp

[codeclimate[bot]]

Code Climate has analyzed commit 453e7b17 and detected 0 issues on this pull request.

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[codecov[bot]]

Codecov Report

Merging #280 (453e7b1) into dev (161575b) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               dev      #280   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            5         5           
  Lines          176       176           
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  Hits           176       176           

Files Changed	Coverage Δ
pytile/tile.py	100.00% <100.00%> (ø)