resolve invalid definition in .mergify.yml

[fmigneault]

Fixes

• Duplicate keys (invalid YAML) were defined instead of simply using the list.
• Fixed a repeated word.

[codecov]

Codecov Report

Merging #618 (474d87b) into main (1956282) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #618   +/-   ##
=======================================
  Coverage   83.76%   83.76%           
=======================================
  Files          18       18           
  Lines        3609     3609           
  Branches      979      979           
=======================================
  Hits         3023     3023           
  Misses        376      376           
  Partials      210      210           

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