Update MANIFEST.in to include recent improvements from other repos.

[trexfeathers]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.93%. Comparing base (c9b1c3b) to head (f81d86e).
⚠️ Report is 120 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6575   +/-   ##
=======================================
  Coverage   89.93%   89.93%           
=======================================
  Files          90       90           
  Lines       24166    24166           
  Branches     4502     4502           
=======================================
  Hits        21733    21733           
  Misses       1672     1672           
  Partials      761      761           

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