refactor: explicitely ignore json-implementation's format hints

Signed-off-by: Jan Kowalleck <jan.kowalleck@gmail.com>

Author: jkowalleck

cyclonedx/model/bom.py

@@ -314,7 +314,12 @@ def __repr__(self) -> str:
         return f'<BomMetaData timestamp={self.timestamp}, component={self.component}>'
 
 
-@serializable.serializable_class(ignore_unknown_during_deserialization=True)
+@serializable.serializable_class(
+    ignore_during_deserialization={
+        '$schema', 'bom_format', 'spec_version',  # JSON-implementation's format hints
+    },
+    ignore_unknown_during_deserialization=True
+)
 class Bom:
     """
     This is our internal representation of a bill-of-materials (BOM).