systemvmtemplate: Update debian 10 iso to 10.5.0 (#4243)

Debian 10.4.0 is not available, therefore SystemVM templates will fail to build with a missing iso.

Fixed updating with the Debian 10.5.0 iso located at https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/

Author: GabrielBrascher

tools/appliance/systemvmtemplate/template.json

@@ -36,8 +36,8 @@
       "disk_size": 2500,
       "disk_interface": "virtio",
       "net_device": "virtio-net",
-      "iso_url": "https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-10.4.0-amd64-netinst.iso",
-      "iso_checksum": "ec69e4bfceca56222e6e81766bf235596171afe19d47c20120783c1644f72dc605d341714751341051518b0b322d6c84e9de997815e0c74f525c66f9d9eb4295",
+      "iso_url": "https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-10.5.0-amd64-netinst.iso",
+      "iso_checksum": "0a6aee1d9aafc1ed095105c052f9fdd65ed00ea9274188c9cd0072c8e6838ab40e246d45a1e6956d74ef1b04a1fc042151762f25412e9ff0cbf49418eef7992e",
       "iso_checksum_type": "sha512",
       "output_directory": "../dist",
       "http_directory": "http",