mergify: unquote base branch name

[tzemanovic]

Describe your changes

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies:
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.25%. Comparing base (3bba226) to head (962f63e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3891      +/-   ##
==========================================
+ Coverage   73.24%   73.25%   +0.01%     
==========================================
  Files         341      341              
  Lines      105240   105240              
==========================================
+ Hits        77081    77092      +11     
+ Misses      28159    28148      -11     

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