AssertJ 3.23.1

[3flex]

Stacks on #4821 - do not merge until that is merged.

[3flex]

Failing due to: assertj/assertj#2357, root cause is KT-17765.

The workarounds aren't very nice, so it might be best to stay on 3.20.2 for now.

[3flex]

KT-17765 should be fixed in Kotlin 1.6.20, so when that is released it should be possible to rebase and merge.

[3flex]

Though KT-17765 seems fixed in Kotlin 1.6.20-M1 it requires using experimental language version 1.7, e.g.:

tasks.compileTestKotlin {
    kotlinOptions.languageVersion = "1.7"
}

We could enable this for test tasks only, but as it's considered experimental, I think it's better to hold back on this until the fix goes stable in Kotlin 1.7. Using the older AssertJ version doesn't block anything.

[codecov]

Codecov Report

Merging #4265 (e382a35) into main (4015679) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #4265   +/-   ##
=========================================
  Coverage     84.92%   84.92%           
  Complexity     3605     3605           
=========================================
  Files           502      502           
  Lines         11873    11873           
  Branches       2227     2227           
=========================================
  Hits          10083    10083           
  Misses          691      691           
  Partials       1099     1099           

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