/usr/share/cups/ppd-updaters/printer-driver-gutenprint.ppd-updater is in printer-driver-gutenprint 5.2.13-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | DRIVER_REGEXP='^gutenprint'
GENNICKNAME_REGEXP='s/ LF / Large Format /; s/-simplified//; s/\s*Simplified//; s/\s+Foomatic\/gutenprint-ijs/ - CUPS+Gutenprint/i; s/\s*v[\d\.]*(|-pre\d+)\s*$//; s/\.[\d\.]*(|-pre\d+)\s*$//'
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