Change password reset URL requirements

As per specified in https://code.djangoproject.com/ticket/31913

Fixes #75

accounts/urls.py

@@ -51,8 +51,8 @@ urlpatterns = [
         ),
         name="password_reset_done",
     ),
-    re_path(
-        r"^reset/(?P<uidb64>[0-9A-Za-z_\-]+)/(?P<token>[0-9A-Za-z]{1,13}-[0-9A-Za-z]{1,20})/a$",
+    path(
+        "reset/<uidb64>/<token>/a",
         auth_views.PasswordResetConfirmView.as_view(
             template_name="accounts/password_reset_confirm.html",
             success_url=reverse_lazy("password_reset_complete"),