Fix warnings

Author: lulunac27a

app.py

@@ -4,7 +4,7 @@
 
 import math
 from typing import Union
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from flask import Flask, render_template, redirect, url_for, request
 from flask_migrate import Migrate as MigrateClass
 from flask_sqlalchemy import SQLAlchemy
@@ -46,7 +46,7 @@ class User(db.Model):  # user class
     )  # user level
     last_time_clicked: datetime = db.Column(
         db.DateTime,
-        default=datetime.utcnow(),
+        default=datetime.now(timezone.utc),
         server_default="CURRENT_TIMESTAMP",
         nullable=False,
     )  # user last time clicked
@@ -59,7 +59,7 @@ def add_xp(self, amount: float) -> None:  # add XP
         Add XP (experience points) to the user.
         amount - the amount to add XP.
         """
-        current_time: datetime = datetime.utcnow()  # get current time
+        current_time: datetime = datetime.now(timezone.utc)  # get current time
         time_difference: timedelta = (
             current_time - self.last_time_clicked
         )  # get time difference