Update hub.py

Attempt to make victron integration compatible with pymodbus API 3.10.0 and greater

"Change slave to device_id and slave= to device_id=. (#2600)"

https://pymodbus.readthedocs.io/en/latest/source/api_changes.html

Author: jacauc

custom_components/victron/hub.py

@@ -86,14 +86,14 @@ def disconnect(self):
     def write_register(self, unit, address, value):
         """Write a register."""
         slave = int(unit) if unit else 1
-        return self._client.write_register(address=address, value=value, slave=slave)
+        return self._client.write_register(address=address, value=value, device_id=slave)
 
     def read_holding_registers(self, unit, address, count):
         """Read holding registers."""
         slave = int(unit) if unit else 1
         _LOGGER.info("Reading unit %s address %s count %s", unit, address, count)
         return self._client.read_holding_registers(
-            address=address, count=count, slave=slave
+            address=address, count=count, device_id=slave
         )
 
     def calculate_register_count(self, registerInfoDict: OrderedDict):