fix(Invoice Ninja Node): Fix issue with custom invoice numbers not working with v5 (#8200)

## Summary
The v5 API expects the invoice number to under the `number` property
rather than `invoice_number`, At some point this month I am going to
bring in the big PR that fixes all of the v5 issues.

## Related tickets and issues
https://github.com/n8n-io/n8n/issues/8191

packages/nodes-base/nodes/InvoiceNinja/QuoteInterface.ts

@@ -23,6 +23,8 @@ export interface IQuote {
 	invoice_items?: IItem[];
 	line_items?: IItem[];
 	invoice_number?: string;
+	// eslint-disable-next-line id-denylist
+	number?: string;
 	invoice_status_id?: number;
 	is_amount_discount?: boolean;
 	is_quote?: boolean;