We've encountered an issue related to two-factor authentication cookie validation after a major Django version upgrade, as detailed in issue [#686](https://github.com/jazzband/django-two-factor-auth/issues/686). This issue arises due to the change in user password hashes when Django's hash iteration count is updated in a new version, leading to a mismatch in the two-factor authentication cookies' validation.

We can for now implement a workaround. This involves catching the `BadSignature` exception raised during the cookie validation process when there's a mismatch in the hashes. This situation occurs after upgrading Django, which causes the user's password hash to change, thereby invalidating the existing two-factor authentication cookies.

This issue is critical for us to upgrade our Django version without disrupting the user experience of people coming back and having a 2FA cookie.

posthog/api/authentication.py
user = User.objects.get(pk=request.session["user_authenticated_but_no_2fa"])
        expiration_time = request.session["user_authenticated_time"] + getattr(
            settings, "TWO_FACTOR_LOGIN_TIMEOUT", 600
        )
        if int(time.time()) > expiration_time:
            raise serializers.ValidationError(
                detail="Login attempt has expired. Re-enter username/password.",
                code="2fa_expired",
            )
        with transaction.atomic():
            device = default_device(user)
            is_allowed = device.verify_is_allowed()
            if not is_allowed[0]:
                raise serializers.ValidationError(detail="Too many attempts.", code="2fa_too_many_attempts")
            if device.verify_token(request.data["token"]):
                return self._token_is_valid(request, user, device)
        
        device.throttle_increment()
        raise serializers.ValidationError(detail="2FA token was not valid", code="2fa_invalid")
class LoginPrecheckViewSet(NonCreatingViewSetMixin, viewsets.GenericViewSet):