How to change the style.css?ver=5.4.1 in WordPress?

When you enqueue the style, you can use filemtime() as the version:

<?php
add_action('wp_enqueue_scripts', 'wpse_367594_enqueue_version');
function wpse_367594_enqueue_version() {
    wp_enqueue_style(
        // Update this to your slug.
        'style-slug',
        // Update to your stylesheet URL if it's not the main style.css.
        get_stylesheet_directory_uri() . '/style.css',
        // Include dependencies here or pass an empty array.
        array('theme-dependency'),
        // Here's the line that sets the version.
        filemtime( get_stylesheet_directory() . '/style.css' ),
        'screen'
    );
}
?>

That should bust most layers of caching so visitors see the latest version whenever the file is updated.