update code for flask 3.0

pywallter.py

@@ -1,7 +1,8 @@
 #!/usr/local/bin/python3
 # -*- coding: utf-8 -*-
-from flask import Flask, request, flash, render_template, url_for, session, redirect, abort, make_response, send_file, escape, send_from_directory
+from flask import Flask, request, flash, render_template, url_for, session, redirect, abort, make_response, send_file, send_from_directory
 from werkzeug.utils import secure_filename
+from markupsafe import escape
 from wtforms import BooleanField, StringField, IntegerField, PasswordField, validators
 import sqlite3
 from flask_bcrypt import Bcrypt