[in_app_purchase] Bump dependencies on json_serializable, build_runner (flutter#4386)

Regenerate output
Also put in a pointer to the json_serializable issue related to creating
stand-alone enum converters

Co-authored-by: Chris Yang <ychris@google.com>

Author: kevmoo

packages/in_app_purchase/in_app_purchase_android/CHANGELOG.md

@@ -1,3 +1,7 @@
+## NEXT
+
+* Update dev_dependency `build_runner` to ^2.0.0 and `json_serializable` to ^5.0.2.
+
 ## 0.1.4+7
 
 * Ensure that the `SkuDetailsWrapper.introductoryPriceMicros` is populated correctly.

packages/in_app_purchase/in_app_purchase_android/lib/src/billing_client_wrappers/enum_converters.dart

@@ -132,6 +132,7 @@ class BillingClientFeatureConverter
 }
 
 // Define a class so we generate serializer helper methods for the enums
+// See https://github.com/google/json_serializable.dart/issues/778
 @JsonSerializable()
 class _SerializedEnums {
   late BillingResponse response;

packages/in_app_purchase/in_app_purchase_android/lib/src/billing_client_wrappers/enum_converters.g.dart

@@ -25,8 +25,8 @@ dependencies:
   meta: ^1.3.0
 
 dev_dependencies:
-  build_runner: ^1.11.1
+  build_runner: ^2.0.0
   flutter_test:
     sdk: flutter
-  json_serializable: ^4.1.1
+  json_serializable: ^5.0.2
   test: ^1.16.0

packages/in_app_purchase/in_app_purchase_android/lib/src/billing_client_wrappers/purchase_wrapper.g.dart

@@ -1,3 +1,7 @@
+## NEXT
+
+* Update dev_dependency `build_runner` to ^2.0.0 and `json_serializable` to ^5.0.2.
+
 ## 0.1.3+4
 
 * Update minimum Flutter SDK to 2.5 and iOS deployment target to 9.0.

packages/in_app_purchase/in_app_purchase_android/lib/src/billing_client_wrappers/sku_details_wrapper.g.dart

@@ -101,6 +101,7 @@ class SKProductDiscountPaymentModeConverter
 }
 
 // Define a class so we generate serializer helper methods for the enums
+// See https://github.com/google/json_serializable.dart/issues/778
 @JsonSerializable()
 class _SerializedEnums {
   late SKPaymentTransactionStateWrapper response;