Update roslyn version

Author: dibarbet

package.json

@@ -36,7 +36,7 @@
     }
   },
   "defaults": {
-    "roslyn": "4.8.0-1.23404.8",
+    "roslyn": "4.8.0-1.23407.6",
     "omniSharp": "1.39.7",
     "razor": "7.0.0-preview.23328.2",
     "razorOmnisharp": "7.0.0-preview.23363.1"