build: bump web3-utils to v4.2.1 in test-plugin-htlc-eth-besu-erc20

Bumps [web3-utils](https://github.com/ChainSafe/web3.js) from 4.0.3 to 4.2.1.
- [Release notes](https://github.com/ChainSafe/web3.js/releases)
- [Changelog](https://github.com/web3/web3.js/blob/4.x/CHANGELOG.md)
- [Commits](web3/web3.js@v4.0.3...v4.2.1)

---
updated-dependencies:
- dependency-name: web3-utils
  dependency-type: direct:production
...

Co-authored-by: Peter Somogyvari <peter.somogyvari@accenture.com>

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Peter Somogyvari <peter.somogyvari@accenture.com>

packages/cactus-test-plugin-htlc-eth-besu-erc20/package.json

@@ -61,7 +61,7 @@
     "axios": "1.6.0",
     "express": "4.19.2",
     "web3-eth-abi": "4.0.3",
-    "web3-utils": "4.0.3"
+    "web3-utils": "4.2.1"
   },
   "devDependencies": {
     "@types/body-parser": "1.19.4",

yarn.lock

@@ -9057,7 +9057,7 @@ __metadata:
     express: "npm:4.19.2"
     uuid: "npm:9.0.1"
     web3-eth-abi: "npm:4.0.3"
-    web3-utils: "npm:4.0.3"
+    web3-utils: "npm:4.2.1"
   languageName: unknown
   linkType: soft