ci: Pin extra test dependencies for generated test suites

[alexander-alderman-webb]

Description

Pin additional dependencies required for testing environments, even when the dependencies are not a dependency of the package an integration patches. These additional dependencies are provided in the deps entry for a package in populate_tox/config.py.

The fetch_package_dependencies() function has a new install_additional_targets parameter. If provided, the packages in the deps entry are added to the targets in the pip dry run that determines dependency pins. Due to the change, DEPENDENCIES_CACHE is now keyed by Python version and a hash of the installation targets.

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 📊

✅ 89953 passed | ⏭️ 6292 skipped | Total: 96245 | Pass Rate: 93.46% | Execution Time: 313m 59s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +35
Passed Tests	📈 +31
Failed Tests	—
Skipped Tests	📈 +4

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2435 uncovered lines.
✅ Project coverage is 89.77%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.77%    89.77%        —%
==========================================
  Files          192       192         —
  Lines        23809     23809         —
  Branches      8218      8218         —
==========================================
+ Hits         21374     21374         —
- Misses        2435      2435         —
- Partials      1347      1347         —

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