Post release for version 1.38.0

[opentelemetrybot]

Post-release updates for version 1.38.0.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.89%. Comparing base (0cf28e9) to head (49ef20c).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #6452   +/-   ##
=========================================
  Coverage     90.88%   90.89%           
  Complexity     6168     6168           
=========================================
  Files           678      678           
  Lines         18484    18484           
  Branches       1813     1813           
=========================================
+ Hits          16800    16801    +1     
  Misses         1147     1147           
+ Partials        537      536    -1     

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