fix(python): fix trezorctl firmware update device restarts' handling

Author: romanz

python/.changelog.d/5000.fixed

@@ -0,0 +1 @@
+Fixed device restart handling during firmware update.

python/src/trezorlib/transport/webusb.py

@@ -75,7 +75,8 @@ def close(self) -> None:
                 self.handle.releaseInterface(self.interface)
                 self.handle.close()
             except Exception as e:
-                raise TransportException(f"USB close failed: {e}") from e
+                # the device may restart before/during `USBDeviceHandle.close()` is called.
+                LOG.warning("Failed to close %s: %s", self.handle, e)
         self.handle = None
 
     def write_chunk(self, chunk: bytes) -> None: