Fixes caine booting

Uses newer 20.04 method for network booting

Closes: https://github.com/netbootxyz/netboot.xyz/issues/1325

roles/netbootxyz/defaults/main.yml

@@ -654,7 +654,7 @@ utilitiesefi:
     enabled: true
     initrd: ${live_endpoint}{{ endpoints.caine.path }}initrd
     kernel: ${live_endpoint}{{ endpoints.caine.path }}vmlinuz ip=dhcp boot=casper
-      netboot=http fetch=${live_endpoint}{{ endpoints.caine.path }}filesystem.squashfs
+      netboot=url url=${live_endpoint}{{ endpoints.caine.path }}filesystem.squashfs
       {{ kernel_params }}
     name: CAINE
     type: direct