Allow None for discovery setter (#405)

Co-authored-by: J. Nick Koston <nick@koston.org>

Author: cdce8p

flux_led/base_device.py

@@ -276,7 +276,7 @@ def discovery(self) -> FluxLEDDiscovery | None:
         return self._discovery
 
     @discovery.setter
-    def discovery(self, value: FluxLEDDiscovery) -> None:
+    def discovery(self, value: FluxLEDDiscovery | None) -> None:
         """Set the discovery data."""
         self._discovery = value