fix(languages): update GitHub languages JSON file

Author: jaebradley

src/languages.json

@@ -7653,6 +7653,22 @@
     "wrap": "false",
     "searchable": "true"
   },
+  {
+    "type": "programming",
+    "color": "#003fa2",
+    "tmScope": "source.slice",
+    "aceMode": "text",
+    "extensions": [
+      ".ice"
+    ],
+    "languageId": 894641667,
+    "name": "Slice",
+    "aliases": [
+      "slice"
+    ],
+    "wrap": "false",
+    "searchable": "true"
+  },
   {
     "group": "HTML",
     "type": "markup",