fix: sandbox/payment-example/frontend/package.json & sandbox/payment-example/frontend/package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-AXIOS-9292519

Author: snyk-bot

sandbox/payment-example/frontend/package-lock.json

@@ -4,7 +4,7 @@
   "description": "payment-example-frontend.",
   "private": true,
   "dependencies": {
-    "axios": "^0.24.0",
+    "axios": "^1.8.2",
     "dotenv": "^8.2.0",
     "mdbreact": "5.2.0",
     "react": "^16.12.0",