<?php
/*
Plugin Name: Stop email change password
Description: Whatever
*/

if ( !function_exists( 'wp_password_change_notification' ) ) {
    function wp_password_change_notification() {}
}
?>

add_filter( 'send_email_change_email', '__return_false' );

/**
 * Disable Admin Notification of User Password Change
 *
 * @see pluggable.php
 */
if ( ! function_exists( 'wp_password_change_notification' ) ) {
    function wp_password_change_notification( $user ) {
        return;
    }
}

/**
 * Disable User Notification of Password Change Confirmation
 */
add_filter( 'send_email_change_email', '__return_false' );

/**
 * Disable sending of the password change email
 */
add_filter( 'send_password_change_email', '__return_false' );

<?php
/*
Plugin Name: Stop email change password
Description: Whatever
*/

if (!function_exists('wp_password_change_notification')) {
    function wp_password_change_notification($user) {
        return;
    }
}
?>