Creates two module-level requests.Session objects (_gitea_session,
_github_session) with an HTTPAdapter backed by urllib3 Retry:
- 3 retries with 0.5s exponential backoff
- retries on 429, 500, 502, 503, 504 and connection errors
- GET-only to avoid unsafe retries
Benefits:
- TCP connections are pooled and reused across all package checks,
including concurrent builds in ThreadPoolExecutor
- Transient network blips no longer cause spurious rebuilds
- Per-request timeouts tightened to 10s (Gitea) / 15s (GitHub)
so failures surface quickly and the retry budget is actually useful
unkinben
3de605d321