Update of gimp-netpbm2gimp-plugins to Netpbm 11.08.00

This is an update of gimp-netpbm2gimp-plugins to correspond to the 29-Sep-2024 release of the Netpbm utilities.

No new utilities have been added recently to Netpbm, but there have been a number of upstream bug fixes and feature enhancements made to various utilities. See the Netpbm change log for a list of everything that's changed in Netpbm v11.08.00 (and all prior versions in the "Advanced" release).