Remove broken link from CONTRIBUTING.md

[Stephan202]

Fixes #2868.

[codecov-commenter]

Codecov Report

Base: 84.78% // Head: 84.76% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (8f02c5a) compared to base (484de45).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2870      +/-   ##
============================================
- Coverage     84.78%   84.76%   -0.03%     
+ Complexity     2868     2867       -1     
============================================
  Files           327      327              
  Lines          8780     8780              
  Branches       1068     1068              
============================================
- Hits           7444     7442       -2     
- Misses         1063     1064       +1     
- Partials        273      274       +1     

Impacted Files	Coverage Δ
...creation/bytebuddy/SubclassByteBuddyMockMaker.java	47.29% <0.00%> (-2.71%)	⬇️

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