ci: fix Renovate config (#3485) [skip ci]

.github/renovate.json

@@ -4,7 +4,7 @@
   "packageRules": [
     {
       "groupName": "@react-native-community/cli",
-      "allowedVersions": "^15.0.0"
+      "allowedVersions": "^15.0.0",
       "matchPackageNames": ["@react-native-community/cli{/,}**"]
     },
     {
@@ -28,7 +28,7 @@
     },
     {
       "groupName": "Metro",
-      "allowedVersions": "^0.81.0"
+      "allowedVersions": "^0.81.0",
       "matchSourceUrls": ["https://github.com/facebook/metro{/,}**"]
     },
     {