remove second path argument of ws_handler per websockets warning

[randomseed42]

Summary

Regarding below warning

.venv\Lib\site-packages\websockets\legacy\server.py:1178: DeprecationWarning: remove second argument of ws_handler
  warnings.warn("remove second argument of ws_handler", DeprecationWarning)

just simply remove path: str argument

# protocols/websockets/websockets_impl.py

## before
async def ws_handler(self, protocol: WebSocketServerProtocol, path: str) -> Any:  # type: ignore[override]

## after
async def ws_handler(self, protocol: WebSocketServerProtocol) -> Any:  # type: ignore[override]

Simple replicate the scenario using flet:

uv run flet create
uv run flet run --web

Before:

❯ uv run flet run --web
flet_app\.venv\Lib\site-packages\websockets\legacy\__init__.py:6: DeprecationWarning: websockets.legacy is deprecated; see https://websockets.readthedocs.io/en/stable/howto/upgrade.html for upgrade instructions
  warnings.warn(  # deprecated in 14.0 - 2024-11-09
flet_app\.venv\Lib\site-packages\uvicorn\protocols\websockets\websockets_impl.py:17: DeprecationWarning: websockets.server.WebSocketServerProtocol is deprecated
  from websockets.server import WebSocketServerProtocol
http://127.0.0.1:57004
flet_app\.venv\Lib\site-packages\websockets\legacy\server.py:1178: DeprecationWarning: remove second argument of ws_handler
  warnings.warn("remove second argument of ws_handler", DeprecationWarning)

After

❯ uv run flet run --web
flet_app\.venv\Lib\site-packages\websockets\legacy\__init__.py:6: DeprecationWarning: websockets.legacy is deprecated; see https://websockets.readthedocs.io/en/stable/howto/upgrade.html for upgrade instructions
  warnings.warn(  # deprecated in 14.0 - 2024-11-09
http://127.0.0.1:53402

Since it seems more complicate to replace WebSocketServerProtocol with ServerConnection per upgrade instruction in https://websockets.readthedocs.io/en/stable/howto/upgrade.html, I'd like to propose this tiny change just for now. Thanks!

Checklist

• I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.