Add @hoisinberg as owner of cirq-google

[hoisinberg]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.38%. Comparing base (72c728a) to head (4e5230a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7703   +/-   ##
=======================================
  Coverage   99.38%   99.38%           
=======================================
  Files        1089     1089           
  Lines       97550    97550           
=======================================
  Hits        96949    96949           
  Misses        601      601           

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[pavoljuhas]

cc @mhucka