ci: Remove brotli from requirements-testing.txt

[alexander-alderman-webb]

Description

Issues

Reminders

• Please add tests to validate your changes, and lint your code using uv run ruff.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Codecov Results 📊

✅ 7 passed | Total: 7 | Pass Rate: 100% | Execution Time: 1.30s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -98129
Passed Tests	📉 -91989
Failed Tests	—
Skipped Tests	📉 -6140

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 18605 uncovered lines.
❌ Project coverage is 21.65%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    89.85%    21.65%    -68.2%
==========================================
  Files          192       192         —
  Lines        23745     23745         —
  Branches      8198      8198         —
==========================================
+ Hits         21334      5140    -16194
- Misses        2411     18605    +16194
- Partials      1344       479      -865

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