update samples

samples/server/petstore/spring-boot-defaultInterface-unhandledException/src/main/java/org/openapitools/api/FakeApi.java

@@ -514,6 +514,7 @@ public interface FakeApi {
         value = "/fake/nullable",
         consumes = { "application/json" }
     )
+    
     ResponseEntity<Void> testNullable(
         @Parameter(name = "ChildWithNullable", description = "request body", required = true) @Valid @RequestBody ChildWithNullable childWithNullable
     ) throws Exception;