Delete comma at the end

.devcontainer/devcontainer.json

@@ -85,5 +85,5 @@
         // This leads to `lualatex` erroring out, see also https://tex.stackexchange.com/q/374303/120853
         // Using "POSIX" is possible and brings us back to vanilla container locale:
         "LC_ALL": "POSIX"
-    },
+    }
 }