Fix linting issues

[asnare]

This PR fixes some linting issues on main:

• Dropped an unnecessary type parameter None on AsyncGenerator.
• Removed type hints for unused arguments on methods that override system interfaces. Not having the hint makes it impossible for us to contradict the type hints on the system interfaces.

[github-actions]

✅ 40/40 passed, 2 skipped, 1m45s total

_{Running from acceptance #377}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.07%. Comparing base (917730c) to head (0c04c79).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #321   +/-   ##
=======================================
  Coverage   80.07%   80.07%           
=======================================
  Files          17       17           
  Lines        2474     2474           
  Branches      533      533           
=======================================
  Hits         1981     1981           
  Misses        364      364           
  Partials      129      129           

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[sundarshankar89]

LGTM