Verify password minimum length in the EDD profile editor.
<?php
/*
 * Plugin Name: Easy Digital Downloads - Force Minimum Password Length in Profile Editor
 * Description: Verify password minimum length in the EDD profile editor.
 * Author: Easy Digital Downloads
 * Author URI: https://easydigitaldownloads.com/
 * Version: 1.0
 */

function pd_edd_pre_update_user_profile( $user_id, $userdata ) {
	// How many characters should the password be?
	$length = 8;

	$password = isset( $_POST['edd_new_user_pass1'] ) ? $_POST['edd_new_user_pass1'] : '';

	if ( ! empty( $password ) && ( strlen( $password ) < $length ) ) {
		edd_set_error( 'password_too_short', sprintf( 'Your password must contain at least %s characters.', $length ) );
	}
}

add_action( 'edd_pre_update_user_profile', 'pd_edd_pre_update_user_profile', 10, 2 );
To implement this snippet on your site, create a brand new, empty WordPress plugin and paste the above code inside.