[FIX] Do not find_package yourself

[eseiler]

CPM usually does a find_package redirect.
If find_package is called for some package added via CPM, it is redirected to CPM.

Before CPM 0.40.6, there was a bug that prevented this redirection from working properly.

If sharg is added via CPM, CPM will call sharg 's CMakeLists.txt.
Because we use find_package there, it is redirected and results in sharg not being available.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.76%. Comparing base (e9bc14b) to head (fb9bf00).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #262   +/-   ##
=======================================
  Coverage   94.76%   94.76%           
=======================================
  Files          18       18           
  Lines        1738     1738           
  Branches       44       44           
=======================================
  Hits         1647     1647           
  Misses         91       91           

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[seqan-actions]

Documentation preview available at https://docs.seqan.de/preview/seqan/sharg-parser/262