ci: Run integration tests on Python 3.14t

[alexander-alderman-webb]

Description

Modifies populate_tox.py to add free-threading Python to the test suite for integrations where we can expect the package to support free-threading. Packages are considered compatible with free-threading if the package itself, and all its dependencies, support free-threading.

Pure Python packages are considered compatible if their dependencies support free-threading. The support for free-threading of package with extension modules is determined based on the ABI tag in the wheel name.

A dry-run of pip install determines the ABI tags of dependencies. Relevant output from the command is cached analogously to responses of PyPI REST calls.

Integrations on Python 3.14 that are currently not included in tox:

• langchain: depends on support python3.14t ijl/orjson#608
• langgraph: depends on support python3.14t ijl/orjson#608
• statsig: depends on grpc
• grpc: Support no-GIL (free-threaded) Python grpc/grpc#38762

Issues

Closes#4971

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• 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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.96%. Comparing base (64c145f) to head (5692877).
⚠️ Report is 8 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@ Coverage Diff @@## master #4995 +/- ## ========================================== - Coverage 84.00% 83.96% -0.05%  ========================================== Files 178 179 +1 Lines 17839 17890 +51 Branches 3171 3181 +10 ========================================== + Hits 14986 15021 +35 - Misses 1894 1902 +8 - Partials 959 967 +8 

see 8 files with indirect coverage changes

[sentrivana]

Awesome!