packer: update VBoxGuestAdditions to v6.1.20

As present in current Debian/unstable

diff --git a/packer/debian64.json b/packer/debian64.json
index d1c2595..a2d1779 100644 (file)
--- a/packer/debian64.json
+++ b/packer/debian64.json
@@ -5,8 +5,8 @@
         "<tab> ssh=grml <enter>"
       ],
       "boot_wait": "5s",
-      "guest_additions_sha256": "88db771a5efd7c048228e5c1e0b8fba56542e9d8c1b75f7af5b0c4cf334f0584",
-      "guest_additions_url": "https://download.virtualbox.org/virtualbox/6.1.16/VBoxGuestAdditions_6.1.16.iso",
+      "guest_additions_sha256": "65d22a9f1fcf690d77be99d549149ec9129e2a728ddd9202df436ed9593ba520",
+      "guest_additions_url": "https://download.virtualbox.org/virtualbox/6.1.20/VBoxGuestAdditions_6.1.20.iso",
       "guest_os_type": "Debian_64",
       "hard_drive_interface": "sata",
       "headless": false,