bug: fix btminer imports

Author: b-rowan

pyasic/miners/backends/btminer.py

@@ -628,9 +628,7 @@ async def _get_errors(
                 pass
         return errors  # type: ignore[return-value]
 
-    async def _get_serial_number(
-        self, rpc_get_miner_info: dict = None
-    ) -> Optional[str]:
+    async def _get_serial_number(self, rpc_get_miner_info: dict = None) -> str | None:
         if rpc_get_miner_info is None:
             try:
                 rpc_get_miner_info = await self.rpc.get_miner_info()
@@ -639,7 +637,7 @@ async def _get_serial_number(
 
         if rpc_get_miner_info is not None:
             try:
-                return rpc_summary["Msg"]["minersn"]
+                return rpc_get_miner_info["Msg"]["minersn"]
             except LookupError:
                 pass
         return None
@@ -1124,9 +1122,7 @@ async def _get_psu_fans(self, rpc_get_device_info: dict | None = None) -> list[F
         rpm = rpc_get_device_info.get("msg", {}).get("power", {}).get("fanspeed")
         return [Fan(speed=rpm)] if rpm is not None else []
 
-    async def _get_serial_number(
-        self, rpc_get_device_info: dict = None
-    ) -> Optional[str]:
+    async def _get_serial_number(self, rpc_get_device_info: dict = None) -> str | None:
         if rpc_get_device_info is None:
             try:
                 rpc_get_device_info = await self.rpc.get_device_info()