Update version to 1.56.0

[otelbot]

Update version to 1.56.0.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.18%. Comparing base (4268621) to head (f1b2de5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7753   +/-   ##
=========================================
  Coverage     90.18%   90.18%           
- Complexity     7196     7197    +1     
=========================================
  Files           814      814           
  Lines         21722    21722           
  Branches       2125     2125           
=========================================
+ Hits          19590    19591    +1     
  Misses         1465     1465           
+ Partials        667      666    -1     

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