wire: use netip.AddrPort in the Preferred Address transport parameter

[marten-seemann]

The previous code had the subtle problem that it would append the IPv6, assuming that it's a 16 byte byte slice:

quic-go/internal/wire/transport_parameters.go

Line 391 in 1083d1f

b = append(b, p.PreferredAddress.IPv6...)

This assumption is not correct if PreferredAddress.IPv6 was left at its default value. The encode value of the transport parameter then has an incorrect length.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (1083d1f) 84.15% compared to head (32b6450) 84.15%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
internal/wire/transport_parameters.go	83.33%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4232      +/-   ##
==========================================
- Coverage   84.15%   84.15%   -0.01%     
==========================================
  Files         149      149              
  Lines       15386    15381       -5     
==========================================
- Hits        12948    12943       -5     
  Misses       1941     1941              
  Partials      497      497              

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