refactor: use f-strings in dynamips nodes

gns3server/compute/dynamips/nodes/bridge.py

@@ -54,9 +54,7 @@ class Bridge(Device):
         :param new_name: New name for this bridge
         """
 
-        await self._hypervisor.send(
-            'nio_bridge rename "{name}" "{new_name}"'.format(name=self._name, new_name=new_name)
-        )
+        await self._hypervisor.send(f'nio_bridge rename "{self._name}" "{new_name}"')
 
         self._name = new_name