systemvmtemplate: fix Debian 11.7.0 ISO URL

Fixes systemvmtemplate build issue

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

Author: yadvr

tools/appliance/systemvmtemplate/template.json

@@ -27,8 +27,8 @@
       "format": "qcow2",
       "headless": true,
       "http_directory": "http",
-      "iso_checksum": "sha512:224cd98011b9184e49f858a46096c6ff4894adff8945ce89b194541afdfd93b73b4666b0705234bd4dff42c0a914fdb6037dd0982efb5813e8a553d8e92e6f51",
-      "iso_url": "https://cdimage.debian.org/debian-cd/11.6.0/amd64/iso-cd/debian-11.6.0-amd64-netinst.iso",
+      "iso_checksum": "sha512:4460ef6470f6d8ae193c268e213d33a6a5a0da90c2d30c1024784faa4e4473f0c9b546a41e2d34c43fbbd43542ae4fb93cfd5cb6ac9b88a476f1a6877c478674",
+      "iso_url": "https://cdimage.debian.org/debian-cd/11.7.0/amd64/iso-cd/debian-11.7.0-amd64-netinst.iso",
       "net_device": "virtio-net",
       "output_directory": "../dist",
       "qemuargs": [