Use mutation cancelOfferTransaction instead of deprecated cancel

[NicolasMahe]

Need update following file to use mutation cancelOfferTransaction instead of deprecated cancel:

liteflow-js/packages/core/mutations/cancelOfferTransaction.graphql

Lines 1 to 7 in d96803b

	# This query should use the mutation `cancelOfferTransaction` to cancel an offer
	query OfferWithCancel($offerId: UUID!, $account: Address!) {
	offer(id: $offerId) {
	cancel(account: $account) {
	...Transaction
	}
	}