fix import

Author: Frosty2500

sdk/basyx/aas/examples/tutorial_serialization_deserialization.py

@@ -10,6 +10,7 @@
 
 from basyx.aas import model
 import basyx.aas.adapter.xml
+import basyx.aas.adapter.json
 
 # 'Details of the Asset Administration Shell' specifies multiple official serialization formats for AAS data. In this
 # tutorial, we show how the Eclipse BaSyx Python library can be used to serialize AAS objects into JSON or XML and to