Update to mavsdk_server 3.9.0

Author: julianoes

MAVSDK_SERVER_VERSION

@@ -1 +1 @@
-v3.8.0
+v3.9.0

mavsdk/telemetry.py

@@ -4739,7 +4739,7 @@ async def scaled_imu(self):
 
     async def raw_imu(self):
         """
-         Subscribe to 'Raw IMU' updates.
+         Subscribe to 'Raw IMU' updates (note that units are are incorrect and "raw" as provided by the sensor)
 
          Yields
          -------

mavsdk/telemetry_pb2_grpc.py

@@ -511,7 +511,7 @@ def SubscribeScaledImu(self, request, context):
         raise NotImplementedError('Method not implemented!')
 
     def SubscribeRawImu(self, request, context):
-        """Subscribe to 'Raw IMU' updates.
+        """Subscribe to 'Raw IMU' updates (note that units are are incorrect and "raw" as provided by the sensor)
         """
         context.set_code(grpc.StatusCode.UNIMPLEMENTED)
         context.set_details('Method not implemented!')