Update manifest.json with missing 'version' to ensure compatibility with newer Home Assistants

[KrzysztofHajdamowicz]

https://github.com/KrzysztofHajdamowicz/home-assistant-vacuum-styj02ym/actions/runs/601197027

[MANIFEST] No 'version' key in the manifest file. This will cause a future version of Home Assistant to block this integration.