Upgrade urllib3 1.26.18 to 2.6.3

[camd]

Summary

Upgrades urllib3 1.26.18 → 2.6.3 and regenerates the log-parser test fixtures it affects.

urllib3 2.x changes how gzip Content-Encoding is decompressed during streaming, which shifts line boundaries in the log parser's output. The parsed content is identical — only the line-number offsets differ — so all 16 .logview.json fixtures are regenerated to match urllib3 2.x decompression behavior.

Changes

• requirements/common.txt: urllib3 1.26.18 → 2.6.3
• requirements/dev.in / requirements/dev.txt: urllib3 2.0.3 → 2.6.3 (urllib3[socks])
• tests/sample_data/logs/*.logview.json: regenerated (16 fixtures) for urllib3 2.x line offsets

Context

This change was previously landed (#9556) and then reverted (#9562). It is intentionally kept separate from the Python 3.14 upgrade (#9324) because:

• It is independent of the Python upgrade — urllib3 1.26.18 runs fine on Python 3.14.
• It carries a log-parser behavior change (the fixture regeneration above) that warrants review on its own rather than being buried in a runtime-version bump.

Testing

• tests/log_parser/ passes with urllib3 2.6.3 and the regenerated fixtures.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.91%. Comparing base (7e55a1b) to head (eb00104).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9568   +/-   ##
=======================================
  Coverage   82.91%   82.91%           
=======================================
  Files         617      617           
  Lines       35681    35681           
  Branches     3272     3281    +9     
=======================================
  Hits        29584    29584           
  Misses       5728     5728           
  Partials      369      369           

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