Add the FOSSA license scan badge shield

[MrAlias]

Fix #6242

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.3%. Comparing base (a4afec7) to head (f9dc0ce).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #6852     +/-   ##
=======================================
- Coverage   81.4%   81.3%   -0.1%     
=======================================
  Files        268     268             
  Lines      24841   24841             
=======================================
- Hits       20222   20220      -2     
- Misses      4229    4231      +2     
  Partials     390     390             

see 3 files with indirect coverage changes

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