code review

Author: bnasslahsen

springdoc-openapi-common/src/main/java/org/springdoc/core/MethodParameterPojoExtractor.java

@@ -44,6 +44,9 @@
 import org.springframework.lang.Nullable;
 
 class MethodParameterPojoExtractor {
+
+	private MethodParameterPojoExtractor() { }
+
 	private static final Nullable NULLABLE_ANNOTATION = new Nullable() {
 		@Override
 		public Class<? extends Annotation> annotationType() {