chore: update dart sample

jdk-21 · jdk-21 · commit 3e855e5200bd · 2026-04-10T09:45:34.000+02:00
diff --git a/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/lib/src/serializers.dart b/samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/lib/src/serializers.dart
@@ -154,7 +154,7 @@ Serializers serializers = (_$serializers.toBuilder()
       )
       ..addBuilderFactory(
         const FullType(BuiltMap, [FullType(String), FullType.nullable(JsonObject)]),
-        () => MapBuilder<String, JsonObject>(),
+        () => MapBuilder<String, JsonObject?>(),
       )
       ..addBuilderFactory(
         const FullType(BuiltMap, [FullType(String), FullType(int)]),

Original file line number	Diff line number	Diff line change
`@@ -154,7 +154,7 @@ Serializers serializers = (_$serializers.toBuilder()`
`154`	`154`	`)`
`155`	`155`	`..addBuilderFactory(`
`156`	`156`	`const FullType(BuiltMap, [FullType(String), FullType.nullable(JsonObject)]),`
`157`		`- () => MapBuilder<String, JsonObject>(),`
	`157`	`+ () => MapBuilder<String, JsonObject?>(),`
`158`	`158`	`)`
`159`	`159`	`..addBuilderFactory(`
`160`	`160`	`const FullType(BuiltMap, [FullType(String), FullType(int)]),`