fix: sort imports in checkout.ts for biome

Author: NatElkins

src/schemas/checkout.ts

@@ -1,12 +1,12 @@
 import { z } from "zod";
+import { CurrencySchema } from "./currency";
 import {
 	BaseInvoiceSchema,
 	DynamicAmountPendingInvoiceSchema,
 	FixedAmountPendingInvoiceSchema,
 	PaidInvoiceSchema,
 } from "./invoice";
 import { CheckoutProductSchema } from "./product";
-import { CurrencySchema } from "./currency";
 
 /**
  * Valid fields that can be required at checkout time.