Change version to 1.81.0-dev

[mbissa]

RELEASE NOTES: none

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.25%. Comparing base (b6597b3) to head (f08c0c7).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8950      +/-   ##
==========================================
- Coverage   83.42%   83.25%   -0.17%     
==========================================
  Files         410      410              
  Lines       32572    32572              
==========================================
- Hits        27172    27119      -53     
- Misses       4030     4058      +28     
- Partials     1370     1395      +25     

see 30 files with indirect coverage changes

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