update(Raster, ModelTime): Deprecation warnings maintenance:

[jlarsen-usgs]

• replace numpy .shape = with .reshape() in Raster
• replace datetime .utcfromtimestamp with .fromtimestamp(timestamp, timezone.utc) in ModelTime

[codecov]

Codecov Report

❌ Patch coverage is 70.83333% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.8%. Comparing base (556c088) to head (bfa371d).
⚠️ Report is 189 commits behind head on develop.

Files with missing lines	Patch %	Lines
flopy/plot/plotutil.py	0.0%	5 Missing ⚠️
flopy/mf6/utils/binaryfile_utils.py	0.0%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2794      +/-   ##
===========================================
+ Coverage     55.5%    72.8%   +17.2%     
===========================================
  Files          644      662      +18     
  Lines       124135   133004    +8869     
===========================================
+ Hits         68947    96832   +27885     
+ Misses       55188    36172   -19016     

Files with missing lines	Coverage Δ
flopy/discretization/modeltime.py	79.4% <100.0%> (+2.5%)	⬆️
flopy/discretization/structuredgrid.py	54.0% <100.0%> (+6.5%)	⬆️
flopy/discretization/vertexgrid.py	80.0% <100.0%> (-3.7%)	⬇️
flopy/mf6/utils/binarygrid_util.py	89.6% <100.0%> (-1.2%)	⬇️
flopy/mf6/utils/model_splitter.py	65.4% <100.0%> (-9.5%)	⬇️
flopy/utils/postprocessing.py	80.1% <100.0%> (+2.5%)	⬆️
flopy/utils/rasters.py	70.0% <100.0%> (-4.0%)	⬇️
flopy/utils/zonbud.py	67.2% <100.0%> (+0.4%)	⬆️
flopy/mf6/utils/binaryfile_utils.py	10.6% <0.0%> (-42.1%)	⬇️
flopy/plot/plotutil.py	52.1% <0.0%> (-4.7%)	⬇️

... and 573 files with indirect coverage changes

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