Fix assertionThat generic argument, fixes #99

[dmfs]

The Quality should be contra-variant in T

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.15% ⚠️

Comparison is base (9ebc4d6) 97.15% compared to head (9d6df3b) 97.01%.

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Additional details and impacted files

@@             Coverage Diff              @@
##               main     #100      +/-   ##
============================================
- Coverage     97.15%   97.01%   -0.15%     
  Complexity      628      628              
============================================
  Files           163      163              
  Lines          1372     1374       +2     
  Branches         47       47              
============================================
  Hits           1333     1333              
- Misses           33       35       +2     
  Partials          6        6              

Files Changed	Coverage Δ
...fidence/junit5/engine/assertion/AssertionThat.java	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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