Upgrade to mypy 1.11.

Author: aaugustin

src/websockets/legacy/auth.py

@@ -178,6 +178,11 @@ async def check_credentials(username: str, password: str) -> bool:
     if create_protocol is None:
         create_protocol = BasicAuthWebSocketServerProtocol
 
+    # Help mypy and avoid this error: "type[BasicAuthWebSocketServerProtocol] |
+    # Callable[..., BasicAuthWebSocketServerProtocol]" not callable  [misc]
+    create_protocol = cast(
+        Callable[..., BasicAuthWebSocketServerProtocol], create_protocol
+    )
     return functools.partial(
         create_protocol,
         realm=realm,

src/websockets/legacy/client.py

@@ -489,6 +489,9 @@ def __init__(
         if subprotocols is not None:
             validate_subprotocols(subprotocols)
 
+        # Help mypy and avoid this error: "type[WebSocketClientProtocol] |
+        # Callable[..., WebSocketClientProtocol]" not callable  [misc]
+        create_protocol = cast(Callable[..., WebSocketClientProtocol], create_protocol)
         factory = functools.partial(
             create_protocol,
             logger=logger,
@@ -641,8 +644,7 @@ def __await__(self) -> Generator[Any, None, WebSocketClientProtocol]:
     async def __await_impl__(self) -> WebSocketClientProtocol:
         async with asyncio_timeout(self.open_timeout):
             for _redirects in range(self.MAX_REDIRECTS_ALLOWED):
-                _transport, _protocol = await self._create_connection()
-                protocol = cast(WebSocketClientProtocol, _protocol)
+                _transport, protocol = await self._create_connection()
                 try:
                     await protocol.handshake(
                         self._wsuri,

src/websockets/legacy/server.py

@@ -1045,6 +1045,9 @@ def __init__(
         if subprotocols is not None:
             validate_subprotocols(subprotocols)
 
+        # Help mypy and avoid this error: "type[WebSocketServerProtocol] |
+        # Callable[..., WebSocketServerProtocol]" not callable  [misc]
+        create_protocol = cast(Callable[..., WebSocketServerProtocol], create_protocol)
         factory = functools.partial(
             create_protocol,
             # For backwards compatibility with 10.0 or earlier. Done here in