Parse datetime with dateutil

[munrojm]

Switch to parsing datetime strings with dateutil.

[codecov]

Codecov Report

Base: 88.38% // Head: 88.44% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (c9fbed0) compared to base (4f5d22c).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #741      +/-   ##
==========================================
+ Coverage   88.38%   88.44%   +0.05%     
==========================================
  Files          41       41              
  Lines        3126     3124       -2     
==========================================
  Hits         2763     2763              
+ Misses        363      361       -2     

Impacted Files	Coverage Δ
src/maggma/utils.py	95.72% <100.00%> (+1.60%)	⬆️

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