No bonds, notes, or other obligations of and no indebtedness incurred by the authority, other than guaranteed revenue bonds, shall constitute an indebtedness or obligation or a pledge of the faith and credit of the State of Georgia or of its agencies; nor shall any act of the authority in any manner constitute or result in the creation of an indebtedness of the state or its agencies or a cause of action against the state or its agencies; provided, however, the state, to the extent permitted by its Constitution, may guarantee payment of such bonds, notes, or other obligations as guaranteed revenue debt.