Revert "Bump codecov/codecov-action from 3 to 4"

[cpelley]

Reverts #1942

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b60bf10) 98.40% compared to head (fbdead8) 98.40%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1978   +/-   ##
=======================================
  Coverage   98.40%   98.40%           
=======================================
  Files         124      124           
  Lines       12067    12067           
=======================================
  Hits        11874    11874           
  Misses        193      193           

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[MoseleyS]

I'm approving this, but in ignorance of what is actually going on.

• What was Dependabot trying to achieve by incrementing this value?
• Will this happen again? If so, how can we prevent it?

[cpelley]

• What was Dependabot trying to achieve by incrementing this value?

Ensuring we use the latest action version. The github action UI becomes stale over time and we should be using the latest version of an action to ensure that it is functions as intended.

• Will this happen again? If so, how can we prevent it?

A consequence of an unofficial action which removed a v4 release after it was created.
codecov/codecov-action#1089 for more context.

Hopefully shouldn't happen in future.