I checked /usr/share/john directory I don't see gpg2john.py there. Also john seems to be of latest version
apt install john                                                                                                                                        
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
john is already the newest version (1.9.0-Jumbo-1+git20211102-0kali1).
Kali version is:
lsb_release -a
No LSB modules are available.
Distributor ID: Kali
Description:    Kali GNU/Linux Rolling
Release:        2021.4
Codename:       kali-rolling