client: support URLs with IPv6 and no port (#313)

[aler9]

Fixes #313

[codecov-commenter]

Codecov Report

Merging #316 (fff0b8e) into main (50a4e51) will decrease coverage by 0.03%.
The diff coverage is 79.41%.

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@@            Coverage Diff             @@
##             main     #316      +/-   ##
==========================================
- Coverage   84.46%   84.43%   -0.03%     
==========================================
  Files          99       99              
  Lines       10146    10153       +7     
==========================================
+ Hits         8570     8573       +3     
- Misses       1253     1256       +3     
- Partials      323      324       +1     

Impacted Files	Coverage Δ
pkg/url/url.go	89.65% <0.00%> (-6.65%)	⬇️
client.go	73.64% <90.00%> (+0.62%)	⬆️

... and 3 files with indirect coverage changes

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