chore: fix the typo

Signed-off-by: Saquib Saifee <[email protected]>

Author: Saquib Saifee

cyclonedx/model/component.py

@@ -1463,6 +1463,7 @@ def cpe(self, cpe: Optional[str]) -> None:
                 CPE(cpe)
             except NotImplementedError:
                 raise ValueError(f'Invalid CPE format: {cpe}')
+        self._cpe = cpe
 
     @property
     @serializable.type_mapping(PackageUrlSH)