Update Codecov to fix GPG issue

[codykaup]

Codecov started failing with a GPG verification issue. This was updated in the later versions of their Action.

Issue for reference: codecov/codecov-action#1956

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 13.35%. Comparing base (2c8182d) to head (28fe808).
⚠️ Report is 19 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next     #436   +/-   ##
=======================================
  Coverage   13.35%   13.35%           
=======================================
  Files         188      188           
  Lines       15772    15772           
  Branches      586      585    -1     
=======================================
  Hits         2107     2107           
  Misses      13584    13584           
  Partials       81       81           

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