http3: add request to response

[Davincible]

fix: #3605

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[codecov]

Codecov Report

Base: 85.48% // Head: 85.48% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (c4ed40e) compared to base (af30cef).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3608   +/-   ##
=======================================
  Coverage   85.48%   85.48%           
=======================================
  Files         140      140           
  Lines       10271    10272    +1     
=======================================
+ Hits         8780     8781    +1     
  Misses       1106     1106           
  Partials      385      385           

Impacted Files	Coverage Δ
http3/client.go	90.50% <100.00%> (+0.04%)	⬆️

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[marten-seemann]

Thank you!