update requeirements to fix versions

Author: Adrian-Tamas

back_end.py

@@ -21,4 +21,4 @@
         db.create_tables_if_not_exists()
     with db:
         db.add_some_data_if_does_not_exist()
-    app.run(host="127.0.0.1", port=50000, debug="True")
+    app.run(host="127.0.0.1", port=50000, debug=True)

requirements.txt

@@ -1,5 +1,5 @@
 mock==4.0.3
-flask==1.1.2
+flask==3.0.2
 sqlalchemy==1.4.35
 faker==13.3.4
-pytest==7.11.1
+pytest==8.0.2