Migrate renovate config

[renovate]

The Renovate config in this repository needs migrating. Typically this is because one or more configuration options you are using have been renamed.

You don't need to merge this PR right away, because Renovate will continue to migrate these fields internally each time it runs. But later some of these fields may be fully deprecated and the migrations removed. So it's a good idea to merge this migration PR soon.

🔕 Ignore: Close this PR and you won't be reminded about config migration again, but one day your current config may no longer be valid.

❓ Got questions? Does something look wrong to you? Please don't hesitate to request help here.

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This PR was generated by Mend Renovate. View the repository job log.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.3%. Comparing base (c5737e8) to head (932c5ec).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1495   +/-   ##
=====================================
  Coverage   90.3%   90.3%           
=====================================
  Files        418     418           
  Lines      35275   35275           
  Branches    2188    2188           
=====================================
+ Hits       31881   31882    +1     
  Misses      2951    2951           
+ Partials     443     442    -1     

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