Update to AssertJ 2.9.0

[PascalSchumacher]

No description provided.

[codecov-io]

Codecov Report

Merging #1342 into release/2.x will increase coverage by 0.01%.
The diff coverage is n/a.

@@                Coverage Diff                @@
##             release/2.x    #1342      +/-   ##
=================================================
+ Coverage          88.17%   88.18%   +0.01%     
- Complexity          2353     2354       +1     
=================================================
  Files                291      291              
  Lines               5935     5935              
  Branches             710      710              
=================================================
+ Hits                5233     5234       +1     
  Misses               521      521              
+ Partials             181      180       -1

Impacted Files	Coverage Δ	Complexity Δ
...ockito/internal/util/reflection/InstanceField.java	75% <0%> (+4.16%)	14% <0%> (+1%)	⬆️

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