feat: make websocket dataclasses sloted (#67)

perf: make websocket dataclass sloted

This is now possible since the min python is 3.10

src/uiprotect/data/websocket.py

@@ -21,7 +21,7 @@
 WS_HEADER_SIZE = 8
 
 
-@dataclass
+@dataclass(slots=True)
 class WSPacketFrameHeader:
     packet_type: int
     payload_format: int
@@ -37,7 +37,7 @@ class WSAction(str, enum.Enum):
     REMOVE = "remove"
 
 
-@dataclass
+@dataclass(slots=True)
 class WSSubscriptionMessage:
     action: WSAction
     new_update_id: str