Fix function signature

Fixed a function signature of `read_array_dimensions` in asyncua/common/node.

ArrayDimentions is always a list of ints because OPC UA has support for multidimentional arrays. But the return type was is specified as int.

asyncua/common/node.py

@@ -227,7 +227,7 @@ class Node:
         v = ua.Variant(value, ua.VariantType.UInt32)
         await self.write_attribute(ua.AttributeIds.ArrayDimensions, ua.DataValue(v))
 
-    async def read_array_dimensions(self) -> int:
+    async def read_array_dimensions(self) -> list[int]:
         """
         Read and return ArrayDimensions attribute of node
         """