Fix typo in CONTRIBUTING.md

[0xh3xa]

Fix typo in CONTRIBUTING.md

[codecov-commenter]

Codecov Report

Merging #1993 into release/3.x will decrease coverage by 0.02%.
The diff coverage is n/a.

@@                Coverage Diff                @@
##             release/3.x    #1993      +/-   ##
=================================================
- Coverage          85.23%   85.21%   -0.03%     
  Complexity          2604     2604              
=================================================
  Files                323      323              
  Lines               7520     7520              
  Branches             899      899              
=================================================
- Hits                6410     6408       -2     
  Misses               873      873              
- Partials             237      239       +2     

Impacted Files	Coverage Δ	Complexity Δ
...to/internal/util/concurrent/WeakConcurrentMap.java	39.36% <0.00%> (-2.13%)	11.00% <0.00%> (ø%)

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[0xh3xa]

closed due to incorrect branch name, the updated one #1994