Avoid CI failures in forks

[mockitoguy]

When contributors fork the repo, they get GH actions that run when they push code to their forks. This change prevents GH Action "release" job failures. Example failure: https://github.com/shestee/mockito/actions/runs/375185562

[codecov-io]

Codecov Report

Merging #2106 (f5419b0) into release/3.x (f8d0f1b) will increase coverage by 0.15%.
The diff coverage is n/a.

@@                Coverage Diff                @@
##             release/3.x    #2106      +/-   ##
=================================================
+ Coverage          84.74%   84.89%   +0.15%     
- Complexity          2717     2720       +3     
=================================================
  Files                325      325              
  Lines               8277     8277              
  Branches             989      989              
=================================================
+ Hits                7014     7027      +13     
+ Misses               992      981      -11     
+ Partials             271      269       -2     

Impacted Files	Coverage Δ	Complexity Δ
...l/creation/bytebuddy/InlineByteBuddyMockMaker.java	70.31% <0.00%> (+2.88%)	51.00% <0.00%> (+3.00%)
...rnal/util/reflection/ReflectionMemberAccessor.java	75.00% <0.00%> (+8.33%)	8.00% <0.00%> (ø%)

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