Update apidiff baseline to released version 1.51.0

[otelbot]

Update apidiff baseline to released version 1.51.0.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.75%. Comparing base (c34a25e) to head (08a4dba).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7403   +/-   ##
=========================================
  Coverage     89.75%   89.75%           
- Complexity     6980     6981    +1     
=========================================
  Files           797      797           
  Lines         21160    21160           
  Branches       2056     2056           
=========================================
+ Hits          18992    18993    +1     
  Misses         1505     1505           
+ Partials        663      662    -1     

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