Fix Python 3.7 bug due to CancelledError being a subclass of Exception

Reference: https://bugs.python.org/issue32528

Author: puddly

zigpy_znp/api.py

@@ -260,7 +260,7 @@ async def connect(self, *, test_port=True) -> None:
                 self.version = await detect_zstack_version(self)
 
                 LOGGER.debug("Detected Z-Stack %s", self.version)
-        except Exception:
+        except (Exception, asyncio.CancelledError):
             LOGGER.debug("Connection to %s failed, cleaning up", self._port_path)
             self.close()
             raise

zigpy_znp/zigbee/application.py

@@ -1114,6 +1114,8 @@ async def _reconnect(self) -> None:
             try:
                 await self._startup()
                 return
+            except asyncio.CancelledError:
+                raise
             except Exception as e:
                 LOGGER.error("Failed to reconnect", exc_info=e)