[tool] update renovate config to take release branch into account

[guillaumejparis]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.73%. Comparing base (5fe4b1a) to head (ab7dabf).
Report is 6 commits behind head on release/1.11.0.

Additional details and impacted files

@@                 Coverage Diff                  @@
##             release/1.11.0    #2189      +/-   ##
====================================================
+ Coverage             32.59%   32.73%   +0.14%     
- Complexity             1514     1549      +35     
====================================================
  Files                   582      583       +1     
  Lines                 18091    18468     +377     
  Branches               1164     1215      +51     
====================================================
+ Hits                   5896     6046     +150     
- Misses                11931    12157     +226     
- Partials                264      265       +1     

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