The allowed_deserialization_classes flag now follows a glob pattern.
For example if one wants to add the class airflow.tests.custom_class to the
allowed_deserialization_classes list, it can be done by writing the full class
name (airflow.tests.custom_class) or a pattern such as the ones used in glob
search (e.g., airflow.*, airflow.tests.*).
If you currently use a custom regexp path make sure to rewrite it as a glob pattern.
Alternatively, if you still wish to match it as a regexp pattern, add it under the new
list allowed_deserialization_classes_regexp instead.