Distro metadata - Update Ubuntu 25.10 to v6.19.3-1

Author: github-actions[bot]

docs/tools/distro-metadata.json

@@ -44,11 +44,11 @@
     {
       "name": "Ubuntu 25.10 - Questing Quokka",
       "iso": [
-        "https://github.com/t2linux/T2-Ubuntu/releases/download/v6.18.5-1/ubuntu-25.10-6.18.5-t2-questing.iso.00",
-        "https://github.com/t2linux/T2-Ubuntu/releases/download/v6.18.5-1/ubuntu-25.10-6.18.5-t2-questing.iso.01",
-        "https://github.com/t2linux/T2-Ubuntu/releases/download/v6.18.5-1/ubuntu-25.10-6.18.5-t2-questing.iso.02"
+        "https://github.com/t2linux/T2-Ubuntu/releases/download/v6.19.3-1/ubuntu-25.10-6.19.3-t2-questing.iso.00",
+        "https://github.com/t2linux/T2-Ubuntu/releases/download/v6.19.3-1/ubuntu-25.10-6.19.3-t2-questing.iso.01",
+        "https://github.com/t2linux/T2-Ubuntu/releases/download/v6.19.3-1/ubuntu-25.10-6.19.3-t2-questing.iso.02"
       ],
-      "sha256": "TBD"
+      "sha256": ""
     },
     {
       "name": "Kubuntu 24.04 - Noble Numbat",
@@ -115,4 +115,4 @@
       ]
     }
   ]
-}
+}