Bump crypto-js from 4.1.1 to 4.2.0 in /backend

Bumps [crypto-js](https://github.com/brix/crypto-js) from 4.1.1 to 4.2.0.
- [Commits](https://github.com/brix/crypto-js/compare/4.1.1...4.2.0)

---
updated-dependencies:
- dependency-name: crypto-js
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

backend/package.json

@@ -43,7 +43,7 @@
     "@types/node": "^18.15.3",
     "axios": "~1.5.0",
     "bitcoinjs-lib": "~6.1.3",
-    "crypto-js": "~4.1.1",
+    "crypto-js": "~4.2.0",
     "express": "~4.18.2",
     "maxmind": "~4.3.11",
     "mysql2": "~3.6.0",