update the ALPN for draft-29

[marten-seemann]

No description provided.

[codecov]

Codecov Report

Merging #2600 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2600   +/-   ##
=======================================
  Coverage   86.22%   86.22%           
=======================================
  Files         122      122           
  Lines        9768     9768           
=======================================
  Hits         8422     8422           
  Misses       1002     1002           
  Partials      344      344           

Impacted Files	Coverage Δ
http3/server.go	64.63% <ø> (ø)

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