Upgrade to pion/webrtc@v4

[Sean-Der]

Resolves pion/webrtc#2557

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (532337d) to head (291a264).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
twitch/main.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #263   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files          25      25           
  Lines        2803    2803           
======================================
  Misses       2803    2803           

Flag	Coverage Δ
go	0.00% <0.00%> (ø)
wasm	0.00% <ø> (ø)

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