Log Message:
py-httpcore: updated to 0.12.2

0.12.2

Fixed
- Properly wrap connect errors on the asyncio backend.
- Fix `ImportError` occurring on Python 3.9 when using the HTTP/1.1 sync client \ 
in a multithreaded context.

0.12.1

Added
- Add connect retries.

Fixed
- Tweak detection of dropped connections, resolving an issue with open files \ 
limits on Linux.
- Avoid leaking connections when establishing an HTTP tunnel to a proxy has failed.
- Properly wrap OS errors when using `trio`.