Fix serialization issue for JSON dumps in "show states" mode

This implements a generic fix to use `repr()` for data to be encoded to JSON values that would normally cause errors like:
`TypeError: Object of type datetime is not JSON serializable`

Signed-off-by: Tobias Wolf <[email protected]>

src/rookify/modules/module.py

@@ -62,7 +62,7 @@ def ssh(self) -> SSH:
         return self._ssh
 
     def _get_readable_json_dump(self, data: Any) -> Any:
-        return json.dumps(data, sort_keys=True, indent="\t")
+        return json.dumps(data, default=repr, sort_keys=True, indent="\t")
 
     def get_readable_key_value_state(self) -> Optional[Dict[str, str]]:
         """