fix(locale): typo in de_CH last name

[rbuetzer]

There is only one person in the Swiss phone directory with the name "Leunberger". "Leuenberger" is more common.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.89%. Comparing base (cd5953b) to head (a64c58f).
⚠️ Report is 1 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #3799   +/-   ##
=======================================
  Coverage   98.89%   98.89%           
=======================================
  Files         887      887           
  Lines        3064     3064           
  Branches      540      556   +16     
=======================================
  Hits         3030     3030           
  Misses         30       30           
  Partials        4        4           

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