Upgrade urllib3 to 2.6.3

[camd]

Summary

Upgrades urllib3 to 2.6.3 (from 1.26.18 in production deps and 2.0.3 in dev deps), moving production onto the actively-maintained 2.x line.

Log parser fixture regeneration

urllib3 2.x changes how gzip Content-Encoding is decompressed during streaming, which shifts line boundaries in the log parser's output. The parsed error content is identical — only the recorded line_number offsets change. Nine .logview.json fixtures are regenerated to match; the other sample logs were unaffected.

Downstream impact

The stored line_number is used by the logviewer to position the error-line highlight and the "jump to first error" scroll. Other consumers (bug suggestions, failure classification, push-health matching) key off the error text, not the line number, and the new_failure tagging match is self-consistent under a uniform shift — so the user-visible effect is confined to where the logviewer highlight lands.

Testing

• pytest tests/log_parser/ → 146 passed with urllib3 2.6.3 installed.
• Negative control: running the same fixtures against urllib3 1.26.18 fails on exactly the 9 regenerated fixtures (line-number mismatches), confirming the fixtures correctly track 2.x behavior.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.94%. Comparing base (c661d06) to head (23475d6).

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #9556    +/-   ##
========================================
  Coverage   82.94%   82.94%            
========================================
  Files         613      613            
  Lines       35372    35372            
  Branches     3263     3269     +6     
========================================
  Hits        29338    29338            
- Misses       5665     5880   +215     
+ Partials      369      154   -215     

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[Archaeopteryx]

The change has been reverted. There was no noticeable improvement on staging, 80% of the tasks checked had a mismatch of the lines. The issue persists after the revert.