change packer arm plugin (for packer 1.10 vs packer 1.11)

Currently have to use older packer 1.10.* because the `` plugin is not compatible with 1.11+.

Several forks might be compatible. are they going to be maintained though. cf https://github.com/mkaczanowski/packer-builder-arm/pull/172 . That is not merged to main branch yet?

(see the boards/raspberry-pi/raspbian.json, looks like the only change needed in .hcl is "arm" to "cross" ?)

Best option? https://github.com/michalfita/packer-plugin-cross

Was active with fixing, but only has "development" branch. Maybe build and use packer plugin install --path $wherebuilt github.com/dbast/cross ? https://github.com/dbast/packer-plugin-cross