🧪 TESTS: Add URL normalisation xfail

[hukkin]

Added an xfail test that passes in JS upstream but not here

[codecov]

Codecov Report

Merging #170 (4c9ccd6) into master (facd548) will not change coverage.
The diff coverage is n/a.

❗ Current head 4c9ccd6 differs from pull request most recent head ebd514f. Consider uploading reports for the commit ebd514f to get more accurate results

@@           Coverage Diff           @@
##           master     #170   +/-   ##
=======================================
  Coverage   96.08%   96.08%           
=======================================
  Files          60       60           
  Lines        3242     3242           
=======================================
  Hits         3115     3115           
  Misses        127      127           

Flag	Coverage Δ
pytests	96.08% <ø> (ø)

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Impacted Files	Coverage Δ
markdown_it/rules_inline/balance_pairs.py	98.14% <0.00%> (ø)

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