improve 0-RTT queue

[marten-seemann]

No description provided.

[codecov]

Codecov Report

Merging #2990 (86cec07) into master (d1c5297) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2990      +/-   ##
==========================================
- Coverage   86.12%   86.11%   -0.01%     
==========================================
  Files         135      135              
  Lines        9379     9374       -5     
==========================================
- Hits         8077     8072       -5     
  Misses        943      943              
  Partials      359      359              

Impacted Files	Coverage Δ
server.go	82.20% <100.00%> (-0.15%)	⬇️
zero_rtt_queue.go	93.75% <100.00%> (-0.37%)	⬇️

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