Fix file extension (typo)

[KyrylR]

• Since this PR suggests a bug fix, the tests have been added and the coverage is 100%.
• Since this PR introduces a new feature, the update has been discussed in an Issue or with the team.
• This PR is just a minor change, like a typo fix.

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[Arvolear]

LFG!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.88%. Comparing base (56312ad) to head (d920a8d).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #166   +/-   ##
=======================================
  Coverage   99.88%   99.88%           
=======================================
  Files          54       54           
  Lines        5282     5282           
  Branches     5282     5282           
=======================================
  Hits         5276     5276           
  Partials        6        6           

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