update java samples

Author: wing328

samples/server/petstore/springboot-builtin-validation/src/main/java/org/openapitools/configuration/EnumConverterConfiguration.java

@@ -7,7 +7,7 @@
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.convert.converter.Converter;
 
-@Configuration
+@Configuration(value = "org.openapitools.configuration.enumConverterConfiguration")
 public class EnumConverterConfiguration {
 
     @Bean(name = "org.openapitools.configuration.EnumConverterConfiguration.enumClassConverter")