Merge pull request #142 from Shopify/2023-04

Use 2023-04 in payment and delivery customization extensions

Author: dphm

checkout/rust/delivery-customization/default/schema.graphql

@@ -1,6 +1,6 @@
 name = "{{name}}"
 type = "{{extensionType}}"
-api_version = "unstable"
+api_version = "2023-04"
 
 [build]
 command = "cargo wasi build --release"