Update packer to version 1.9.x and add warning regarding the 1.10.x version
We should go ahead and update our version of packer to the latest 1.9.x (double check confirm it's still MPL 2.0)
and add a note/comment next to where we set the version that references #71 so that it's clear the next time we update that we need to take more action than just updating the version to 1.10 (because of the license change in 1.10)
Edited by DJ Mountney