Httpx-ws

Bug fixes and improvements
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* Fix `ASGIWebSocketAsyncNetworkStream` implementation to avoid async tasks issues. Thanks graingert 🎉

New features
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* Allow to pass a custom `session_class` on `connect_ws`/`aconnect_ws` functions. Thanks GreyElaina 🎉

Breaking changes
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* Drop Python 3.8 support.

Bug fixes and improvements
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* Fix 29: prevent error when several tasks try to write simultaneously on the same websocket stream. Thanks GreyElaina 🎉
* Fix 90: don't use a blocking portal to run the ASGIWebSocketTransport. Thanks GreyElaina 🎉

Bug fixes and improvements
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* Improve efficiency of `WebSocketSession` by reusing a single thread pool when waiting for messages. Thank you davidbrochart 🎉

Bug fixes
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* Fix (73) anyio misusages. Thanks agronholm 🎉
* Fix (74) unclosed anyio streams. Thanks agronholm 🎉
* Fix (76) memory leak with non-async WebSocketSession. Thanks ro-oliveira95 🎉

Breaking changes
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* [`AsyncWebSocketSession`](https://frankie567.github.io/httpx-ws/reference/httpx_ws/#httpx_ws.AsyncWebSocketSession) and [`WebSocketSession`](https://frankie567.github.io/httpx-ws/reference/httpx_ws/#httpx_ws.WebSocketSession) no longer accept the `subprotocol` parameter. It's automatically set from the `response` headers (see below).

> [!NOTE]
> If you only use the `connect_ws` and `aconnect_ws` functions, you don't need to change anything.

Improvements
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* [`AsyncWebSocketSession`](https://frankie567.github.io/httpx-ws/reference/httpx_ws/#httpx_ws.AsyncWebSocketSession) and [`WebSocketSession`](https://frankie567.github.io/httpx-ws/reference/httpx_ws/#httpx_ws.WebSocketSession) now accepts the original HTTPX handshake response in parameter. Thanks WSH032 🎉

Bug fixes
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* Set `anyio` dependency lower bound version to `>4`