chore: Pin urllib3 to <2

[jennifer-richards]

No description provided.

[codecov]

Codecov Report

Merging #6321 (052725d) into main (32bb4ef) will increase coverage by 0.02%.
Report is 27 commits behind head on main.
The diff coverage is 98.48%.

@@            Coverage Diff             @@
##             main    #6321      +/-   ##
==========================================
+ Coverage   88.69%   88.71%   +0.02%     
==========================================
  Files         290      290              
  Lines       40390    40414      +24     
==========================================
+ Hits        35823    35855      +32     
+ Misses       4567     4559       -8     

Files Changed	Coverage Δ
ietf/help/views.py	63.63% <ø> (+8.46%)	⬆️
ietf/ipr/models.py	88.95% <ø> (ø)
ietf/urls.py	80.00% <ø> (-0.56%)	⬇️
ietf/ipr/views.py	87.96% <95.45%> (+0.24%)	⬆️
ietf/doc/models.py	88.98% <100.00%> (ø)
ietf/doc/utils.py	87.38% <100.00%> (+0.23%)	⬆️
ietf/doc/views_review.py	95.16% <100.00%> (+0.20%)	⬆️
ietf/doc/views_search.py	89.09% <100.00%> (-0.21%)	⬇️
ietf/ipr/feeds.py	93.33% <100.00%> (+0.22%)	⬆️
ietf/ipr/sitemaps.py	100.00% <100.00%> (ø)
... and 2 more

... and 2 files with indirect coverage changes