add commas to fix errors from dry-run

Author: esilverm

.github/renovate.json5

@@ -2,7 +2,7 @@
   extends: [
     "github>apollographql/renovate-config-apollo-open-source:default.json5",
     "github>Turbo87/renovate-config//rust/updateToolchain",
-  ]
+  ],
   packageRules: [
     {
       enabled: false,
@@ -13,7 +13,7 @@
   // https://docs.renovatebot.com/modules/manager/nix/
   nix: {
     enabled: true,
-  }
+  },
   vulnerabilityAlerts: {
     enabled: true,
   },