Python3.9: Follow change in error message for unpacking
Python3.9: Follow change in error message for unpacking

* This depends on recent optimization that added
  a code variant that does raise the different
  exception.

* Long term it would be good to generate variants of the code instead.

kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka