return an error when parsing a too long connection ID from a header

[marten-seemann]

Fixes #3532.

[codecov]

Codecov Report

Base: 85.56% // Head: 85.56% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (f41772c) compared to base (3f1adfd).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3533   +/-   ##
=======================================
  Coverage   85.56%   85.56%           
=======================================
  Files         137      137           
  Lines       10087    10089    +2     
=======================================
+ Hits         8630     8632    +2     
  Misses       1080     1080           
  Partials      377      377           

Impacted Files	Coverage Δ
internal/wire/header.go	87.88% <100.00%> (+0.15%)	⬆️

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