Drop unused dependency async-timeout

[billchenchina]

No description provided.

[greptile-apps]

Confidence Score: 5/5

Safe to merge: the updated dependency set installs cleanly and the complete test suite passes without async-timeout.

No defects remain after exercising the dependency-removal path in fresh environments and rechecking the resulting installation.

Files Needing Attention: No files need further attention; requirements.txt was the only changed file and its updated dependency set was verified.

T-Rex Logs

What T-Rex did

• Created fresh environments from the parent, updated requirements.txt, and installed dependencies with --no-cache-dir.
• In the updated environment, pip check reported no broken requirements, async-timeout was not present, and pytest -q tests/ passed all 22 tests.
• Re-ran the dependency and full-suite checks in the updated environment and observed the same successful results, confirming the removed package is not required by the project.

_{Ran code and verified through T-Rex}

_{Reviews (1): Last reviewed commit: "Drop unused dependency async-timeout" | Re-trigger Greptile}

[billchenchina]

oops i forgot i opened #1008 before