Advise to use git ls-remote --branches instead of --heads

[pavoljuhas]

The --heads option is a deprecated synonym of --branches.
Also fix unrelated typo.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.37%. Comparing base (dbde273) to head (6485896).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7660   +/-   ##
=======================================
  Coverage   99.37%   99.37%           
=======================================
  Files        1082     1082           
  Lines       96700    96700           
=======================================
  Hits        96097    96097           
  Misses        603      603           

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[mhucka]

Lookin' good.