fix: add missing comma in package.json dependencies

Author: Amine

packages/react-native/package.json

@@ -45,7 +45,7 @@
   "dependencies": {
     "@powersync/common": "workspace:*",
     "@powersync/react": "workspace:*",
-    "expo-file-system": "18.0.12"
+    "expo-file-system": "18.0.12",
     "async-mutex": "^0.5.0"
   },
   "devDependencies": {