Fix retrieval code

certification_classes: Mapping[str, type[ColiCertification]] = {

    cls.required_office_kind_name: cls

    for cls in get_args(ColiCertification.__value__)

    # Unnecessary complex hack. We want to get out all the classes which make up the alias "ColiCertification".

    # We first need to access the value of the alias (this is either a union or a single type).

    # If it is a union, then we need get_args to get all the types in the union, otherwise, we just put the

    # single type in a tuple for consistency.

    for cls in get_args(ColiCertification.__value__) or (ColiCertification.__value__, )

}