don't pass the QUIC version to the StartedConnection event

[marten-seemann]

The version might change in response to a Version Negotiation packet.

[codecov]

Codecov Report

Merging #3109 (22daaf4) into master (ea14ce5) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3109      +/-   ##
==========================================
+ Coverage   85.45%   85.57%   +0.12%     
==========================================
  Files         131      131              
  Lines        9657    10280     +623     
==========================================
+ Hits         8252     8797     +545     
- Misses       1036     1063      +27     
- Partials      369      420      +51     

Impacted Files	Coverage Δ
qlog/event.go	97.92% <ø> (-0.01%)	⬇️
qlog/qlog.go	90.60% <ø> (-0.04%)	⬇️
client.go	78.33% <100.00%> (ø)
logging/multiplex.go	97.56% <100.00%> (ø)
session.go	79.23% <100.00%> (+2.12%)	⬆️
internal/ackhandler/ackhandler.go	0.00% <0.00%> (ø)
internal/congestion/cubic_sender.go	88.70% <0.00%> (+2.09%)	⬆️
internal/ackhandler/sent_packet_handler.go	81.71% <0.00%> (+4.46%)	⬆️

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