ci: unify test matrix

[lukasberbuer]

Single test with cross-platform test matrix.

Wrong coverage #191 is fixed with disable_search parameter in codecov-action.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 85.19%. Comparing base (7c111b3) to head (aefe3b6).

Files	Patch %	Lines
src/Crypto.cpp	60.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
- Coverage   94.93%   85.19%   -9.74%     
==========================================
  Files         104       80      -24     
  Lines        5371     4351    -1020     
  Branches      720     1745    +1025     
==========================================
- Hits         5099     3707    -1392     
- Misses        150      202      +52     
- Partials      122      442     +320     

Flag	Coverage Δ
Linux	85.19% <60.00%> (?)

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