adding import

added the import statement

servlet/spring-boot/java/oauth2/resource-server/hello-security/src/main/java/example/OAuth2ResourceServerSecurityConfiguration.java

@@ -26,6 +26,8 @@ import org.springframework.security.oauth2.jwt.JwtDecoder;
 import org.springframework.security.oauth2.jwt.NimbusJwtDecoder;
 import org.springframework.security.web.SecurityFilterChain;
 
+import static org.springframework.security.config.Customizer.withDefaults;
+
 /**
  * OAuth resource configuration.
  *