Log Message:
py-httpcore: updated to 0.18.0

0.18.0 (September 8th, 2023)

- Add support for HTTPS proxies.
- Drop Python 3.7 support.
- Handle `sni_hostname` extension with SOCKS proxy.
- Handle HTTP/1.1 half-closed connections gracefully.
- Change the type of `Extensions` from `Mapping[Str, Any]` to \ 
`MutableMapping[Str, Any]`.