Fix failed tests related to w3lib

[Laerte]

This fix failed tests from this issue: #5612

- tox.wiki is offline that's why checks is failing (tox-dev/tox#2486)

[codecov]

Codecov Report

Merging #5617 (6186e82) into master (52d9349) will not change coverage.
The diff coverage is n/a.

❗ Current head 6186e82 differs from pull request most recent head 582a6bf. Consider uploading reports for the commit 582a6bf to get more accurate results

@@           Coverage Diff           @@
##           master    #5617   +/-   ##
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  Coverage   88.85%   88.85%           
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  Files         162      162           
  Lines       10962    10962           
  Branches     1894     1894           
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  Hits         9740     9740           
  Misses        942      942           
  Partials      280      280           

[Gallaecio]

I am thinking we should skip the tests instead, with @pytest.mark.skipIf(…, strict=True, reason="w3lib 2.0.0 and later do not allow invalid domains.").

Also, while I don’t think we need to address it here, we need to keep the target issue open or create a new one to actually figure out how to test IPv6 support now.

[Laerte]

@Gallaecio Done.