Fix up remaining start_soon's

src/cocotb_bus/drivers/__init__.py

@@ -89,7 +89,7 @@ def __init__(self):
             self.log = SimLog("cocotb.driver.%s" % (type(self).__qualname__))
 
         # Create an independent coroutine which can send stuff
-        self._thread = cocotb.scheduler.add(self._send_thread())
+        self._thread = cocotb.start_soon(self._send_thread())
 
     async def _acquire_lock(self):
         if self.busy:

src/cocotb_bus/drivers/amba.py

@@ -301,7 +301,7 @@ async def write(
         write_data = self._send_write_data(address, value, burst, size,
                                            data_latency, byte_enable, sync)
 
-        await Combine(cocotb.start_soon(write_address), cocotb.fork(write_data))
+        await Combine(cocotb.start_soon(write_address), cocotb.start_soon(write_data))
 
         async with self.write_response_busy:
             # Wait for the response

src/cocotb_bus/monitors/__init__.py

@@ -64,7 +64,7 @@ def __init__(self, callback=None, event=None):
             self.add_callback(callback)
 
         # Create an independent coroutine which can receive stuff
-        self._thread = cocotb.scheduler.add(self._monitor_recv())
+        self._thread = cocotb.start_soon(self._monitor_recv())
 
     def kill(self):
         """Kill the monitor coroutine."""