only send Version Negotiation packets for packets larger than 1200 bytes

[marten-seemann]

No description provided.

[codecov]

Codecov Report

Merging #2820 into master will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2820      +/-   ##
==========================================
- Coverage   83.74%   83.73%   -0.01%     
==========================================
  Files         272      275       +3     
  Lines       22029    22208     +179     
==========================================
+ Hits        18447    18595     +148     
- Misses       2880     2906      +26     
- Partials      702      707       +5     

Impacted Files	Coverage Δ
internal/protocol/protocol.go	100.00% <ø> (ø)
server.go	83.29% <100.00%> (+0.24%)	⬆️
D:/a/quic-go/quic-go/internal/qtls/qtls.go	87.22% <0.00%> (ø)
D:/a/quic-go/quic-go/internal/qtls/go114.go	39.13% <0.00%> (ø)
...:/a/quic-go/quic-go/internal/qtls/structs_equal.go	100.00% <0.00%> (ø)
D:/a/quic-go/quic-go/server.go	81.66% <0.00%> (+0.21%)	⬆️

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