Update pymatgen req and api notebook

[munrojm]

• Update pymatgen version
• Change MPRester imports to be from pymatgen.ext.matproj

[codecov-commenter]

Codecov Report

Base: 79.27% // Head: 79.27% // No change to project coverage 👍

Coverage data is based on head (b824394) compared to base (b4b7d6b).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #104   +/-   ##
=======================================
  Coverage   79.27%   79.27%           
=======================================
  Files           5        5           
  Lines         304      304           
=======================================
  Hits          241      241           
  Misses         63       63           

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