Httpcore

- Handle `EndOfStream` exception for anyio backend. (899)
- Allow trio `0.25.*` series in package dependancies. (903)

- Add `target` request extension. (888)
- Fix support for connection `Upgrade` and `CONNECT` when some data in the stream has been read. (882)

- Fix support for async cancellations. (880)
- Fix trace extension when used with socks proxy. (849)
- Fix SSL context for connections using the "wss" scheme (869)

- Fix `float("inf")` timeouts in `Event.wait` function. (846)

- Fix pool timeout to account for the total time spent retrying. (823)
- Raise a neater RuntimeError when the correct async deps are not installed. (826)
- Add support for synchronous TLS-in-TLS streams. (840)

From version 1.0 our async support is now optional, as the package has minimal dependencies by default.

For async support use either `pip install 'httpcore[asyncio]'` or `pip install 'httpcore[trio]'`.

The project versioning policy is now explicitly governed by SEMVER. See https://semver.org/.

- Async support becomes fully optional. (809)
- Add support for Python 3.12. (807)