ci: Remove httpcore 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 📊

✅ 91384 passed | ⏭️ 6240 skipped | Total: 97624 | Pass Rate: 93.61% | Execution Time: 325m 48s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +106
Passed Tests	📈 +2
Failed Tests	—
Skipped Tests	📈 +104

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2407 uncovered lines.
✅ Project coverage is 89.86%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.84%    89.86%    +0.02%
==========================================
  Files          192       192         —
  Lines        23745     23744        -1
  Branches      8198      8198         —
==========================================
+ Hits         21334     21337        +3
- Misses        2411      2407        -4
- Partials      1344      1345        +1

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