Log Message:
py-httpcore: updated to 0.12.3

0.12.3

Fixed

- Abort SSL connections on close rather than waiting for remote EOF when using \ 
`asyncio`.
- Fix exception raised in case of connect timeouts when using the `anyio` backend.
- Fix `Host` header precedence for `:authority` in HTTP/2.
- Handle extra edge case when detecting for socket readability when using `asyncio`.
- Fix `asyncio` SSL warning when using proxy tunneling.