fix(deps): update dependency @growthbook/growthbook-react to v1.2.1

Author: renovate[bot]

packages/use-growthbook/package.json

@@ -41,7 +41,7 @@
     "feature flags"
   ],
   "dependencies": {
-    "@growthbook/growthbook-react": "1.2.0"
+    "@growthbook/growthbook-react": "1.2.1"
   },
   "devDependencies": {
     "react": "18.3.1"