chore(ci): Switch to Codecov action

[effigies]

Also updating dependabot to group PRs when updating actions in the future.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.60%. Comparing base (33e7895) to head (1da5407).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2139      +/-   ##
==========================================
+ Coverage   85.72%   87.60%   +1.88%     
==========================================
  Files          91      133      +42     
  Lines        3782     7003    +3221     
  Branches     1220     1657     +437     
==========================================
+ Hits         3242     6135    +2893     
- Misses        454      773     +319     
- Partials       86       95       +9     

Flag	Coverage Δ
	85.72% <ø> (?)

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