Fix @Mock(serializable = true) for parameterized types.

[cpovirk]

Fixes #2979

Checklist

• Read the contributing guide
• PR should be motivated, i.e. what does it fix, why, and if relevant how
• If possible / relevant include an example in the description, that could help all readers
  including project members to get a better picture of the change
• Avoid other runtime dependencies
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  commit is meaningful and help the people that will explore a change in 2 years
• The pull request follows coding style
• Mention Fixes #<issue number> in the description if relevant
• At least one commit should mention Fixes #<issue number> if relevant

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6e0c228) 85.70% compared to head (080674f) 85.70%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #3007   +/-   ##
=========================================
  Coverage     85.70%   85.70%           
  Complexity     2876     2876           
=========================================
  Files           326      326           
  Lines          8733     8733           
  Branches       1078     1078           
=========================================
  Hits           7485     7485           
  Misses          971      971           
  Partials        277      277           

Impacted Files	Coverage Δ
...o/internal/creation/settings/CreationSettings.java	96.49% <ø> (ø)

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[TimvdLippe]

Thanks!