Added Serialization Values

Issue gh-16276

ldap/src/main/java/org/springframework/security/ldap/userdetails/LdapUserDetailsManager.java

@@ -18,6 +18,7 @@ package org.springframework.security.ldap.userdetails;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.io.Serial;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.LinkedList;
@@ -491,6 +492,9 @@ public class LdapUserDetailsManager implements UserDetailsManager {
 	 */
 	private static class PasswordModifyRequest implements ExtendedRequest {
 
+		@Serial
+		private static final long serialVersionUID = 3154223576081503237L;
+
 		private static final byte SEQUENCE_TYPE = 48;
 
 		private static final String PASSWORD_MODIFY_OID = "1.3.6.1.4.1.4203.1.11.1";