Clear read deadline in http/2 ws case

[FZambia]

Connection is under our control after that, so no need to inherit read deadline set by HTTP server (ReadTimeout) - otherwise connection is being closed upon deadline expiration.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.11%. Comparing base (fecb61d) to head (0a51799).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #521      +/-   ##
==========================================
+ Coverage   84.97%   85.11%   +0.13%     
==========================================
  Files          42       42              
  Lines        7947     7947              
==========================================
+ Hits         6753     6764      +11     
+ Misses        809      802       -7     
+ Partials      385      381       -4     

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