Mergify: configuration update

[mr-c]

This change has been made by @mr-c from https://mergify.io config editor.

[codecov]

Codecov Report

Merging #365 (54f2df3) into main (d31e2ef) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #365      +/-   ##
==========================================
+ Coverage   70.17%   70.24%   +0.06%     
==========================================
  Files          16       16              
  Lines        2863     2863              
  Branches      750      750              
==========================================
+ Hits         2009     2011       +2     
  Misses        668      668              
+ Partials      186      184       -2     

Impacted Files	Coverage Δ
schema_salad/ref_resolver.py	84.98% <0.00%> (+0.14%)	⬆️
schema_salad/fetcher.py	85.86% <0.00%> (+1.08%)	⬆️

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