fix: examples/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-7577916
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-7577917
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-7577918
- https://snyk.io/vuln/SNYK-JS-WEB3UTILS-6229337
- https://snyk.io/vuln/SNYK-JS-WS-7266574
- https://snyk.io/vuln/SNYK-JS-TAR-6476909
- https://snyk.io/vuln/SNYK-JS-REQUEST-3361831
- https://snyk.io/vuln/SNYK-JS-TOUGHCOOKIE-5672873
- https://snyk.io/vuln/SNYK-JS-PATHTOREGEXP-7925106
- https://snyk.io/vuln/SNYK-JS-WS-1296835

examples/package.json

@@ -63,9 +63,9 @@
     "@allbridge/bridge-core-sdk": "file:..",
     "@solana/web3.js": "^1.78.5",
     "tronweb": "^4.4.0",
-    "web3": "^1.9.0",
+    "web3": "^4.8.0",
     "web3-core": "^1.9.0",
-    "web3-eth-contract": "^1.9.0",
+    "web3-eth-contract": "^4.4.0",
     "web3-utils": "^1.9.0"
   },
   "devDependencies": {