Declare nested test classes as non-static

[schalkms]

The @nested annotation cannot be used on static classes.

[codecov]

Codecov Report

Merging #4894 (9fffc61) into main (16b6658) will increase coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #4894      +/-   ##
============================================
+ Coverage     84.73%   84.80%   +0.06%     
- Complexity     3480     3488       +8     
============================================
  Files           495      495              
  Lines         11464    11464              
  Branches       2122     2122              
============================================
+ Hits           9714     9722       +8     
  Misses          685      685              
+ Partials       1065     1057       -8     

Impacted Files	Coverage Δ
...gitlab/arturbosch/detekt/rules/style/UseOrEmpty.kt	74.07% <0.00%> (ø)
...gitlab/arturbosch/detekt/rules/style/UseRequire.kt	94.11% <0.00%> (ø)
...b/arturbosch/detekt/rules/style/UseCheckNotNull.kt	92.30% <0.00%> (ø)
...b/arturbosch/detekt/rules/style/UseCheckOrError.kt	85.71% <0.00%> (ø)
.../arturbosch/detekt/rules/style/UseIsNullOrEmpty.kt	57.14% <0.00%> (ø)
...arturbosch/detekt/rules/style/UnnecessaryFilter.kt	80.55% <0.00%> (ø)
...arturbosch/detekt/rules/style/UseRequireNotNull.kt	92.30% <0.00%> (ø)
...rbosch/detekt/rules/style/ObjectLiteralToLambda.kt	81.08% <0.00%> (ø)
...arturbosch/detekt/rules/bugs/IgnoredReturnValue.kt	82.85% <0.00%> (ø)
...rturbosch/detekt/rules/bugs/UnusedUnaryOperator.kt	66.66% <0.00%> (ø)
... and 20 more

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