fix: upgrade @ethereumjs/tx from 4.1.1 to 4.2.0

Snyk has created this PR to upgrade @ethereumjs/tx from 4.1.1 to 4.2.0.

See this package in npm:
https://www.npmjs.com/package/@ethereumjs/tx

See this project in Snyk:
https://app.snyk.io/org/sammyfilly/project/f1b8af31-f216-4217-8a5c-457ace27fb07?utm_source=github&utm_medium=referral&page=upgrade-pr

src/chains/ethereum/utils/package.json

@@ -50,7 +50,7 @@
   "dependencies": {
     "@ethereumjs/common": "3.1.1",
     "@ethereumjs/evm": "1.3.1",
-    "@ethereumjs/tx": "4.1.1",
+    "@ethereumjs/tx": "4.2.0",
     "@ethereumjs/util": "8.0.5",
     "@ethereumjs/vm": "6.4.1",
     "@ganache/ethereum-address": "0.8.0",