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
)
        request = self.context["request"]
        user = cast(
            Optional[User],
            authenticate(
                request,
                email=validated_data["email"],
                password=validated_data["password"],
            ),
        )
        if not user:
            raise serializers.ValidationError("Invalid email or password.", code="invalid_credentials")
        
        if is_email_available() and user.is_email_verified is not True:
            EmailVerifier.create_token_and_send_email_verification(user)
            
            
            if user.is_email_verified is False:
                raise serializers.ValidationError(
                    "Your account is awaiting verification. Please check your email for a verification link.",
                    code="not_verified",
                )
        if self._check_if_2fa_required(user):
            request.session["user_authenticated_but_no_2fa"] = user.pk
            request.session["user_authenticated_time"] = time.time()
            raise TwoFactorRequired()
        login(request, user, backend="django.contrib.auth.backends.ModelBackend")
        report_user_logged_in(user, social_provider="")
        return user
class LoginPrecheckSerializer(serializers.Serializer):