Fix typo in .gitignore (backport #2446)

[mergify]

This is an automatic backport of pull request #2446 done by Mergify.

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (e538316) 50.95% compared to head (73670e8) 50.94%.
Report is 1 commits behind head on humble.

Additional details and impacted files

@@            Coverage Diff             @@
##           humble    #2447      +/-   ##
==========================================
- Coverage   50.95%   50.94%   -0.01%     
==========================================
  Files         382      382              
  Lines       31892    31892              
==========================================
- Hits        16247    16243       -4     
- Misses      15645    15649       +4     

see 1 file with indirect coverage changes

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