fix: ignore codecov-action in renovate.json

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Codecov now needs a CODECOV_ACTION token in v4 #1435
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Altogether stops repositories from being upgraded to codecov/codev-action@v4.

This can always be revisited if & when Codecov provides more details on tokenless uploads (codecov/codecov-action#1293).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.04%. Comparing base (1312e3b) to head (1a52b29).
Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1436   +/-   ##
=======================================
  Coverage   98.04%   98.04%           
=======================================
  Files         101      101           
  Lines        5672     5673    +1     
  Branches      499      499           
=======================================
+ Hits         5561     5562    +1     
  Misses        110      110           
  Partials        1        1           

Flag	Coverage Δ
create	69.91% <100.00%> (+<0.01%)	⬆️
initialize	42.54% <0.00%> (-0.01%)	⬇️
migrate	69.83% <100.00%> (+<0.01%)	⬆️
unit	78.64% <0.00%> (-0.02%)	⬇️

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[github-actions]

🎉 This is included in version v1.57.10 🎉

The release is available on:

• GitHub releases
• npm package (@latest dist-tag)

Cheers! 📦🚀