fix flaky qlog unit tests

[marten-seemann]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2572 into master will increase coverage by 0.32%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2572      +/-   ##
==========================================
+ Coverage   86.19%   86.51%   +0.32%     
==========================================
  Files         122      122              
  Lines        9583    10062     +479     
==========================================
+ Hits         8260     8705     +445     
- Misses        985     1008      +23     
- Partials      338      349      +11     

Impacted Files	Coverage Δ
internal/ackhandler/received_packet_handler.go	73.97% <0.00%> (+1.56%)	⬆️
session.go	77.32% <0.00%> (+1.98%)	⬆️
packet_packer.go	87.72% <0.00%> (+2.84%)	⬆️
internal/ackhandler/sent_packet_handler.go	78.55% <0.00%> (+7.63%)	⬆️

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