feat: upgrade ethers from 5.7.2 to 6.8.0

Snyk has created this PR to upgrade ethers from 5.7.2 to 6.8.0.

See this package in npm:
https://www.npmjs.com/package/ethers

See this project in Snyk:
https://app.snyk.io/org/woodpile37/project/f0dcf1c9-ecf1-445b-bc07-e8f73c595f54?utm_source=github&utm_medium=referral&page=upgrade-pr

assets/eip-4675/package.json

@@ -27,7 +27,7 @@
  "@types/yargs": "^17.0.8",
  "chai": "^4.3.4",
  "ethereum-waffle": "^4.0.10",
- "ethers": "^5.5.3",
+ "ethers": "^6.8.0",
  "hardhat": "^2.8.2",
  "hardhat-deploy": "^0.11.24",
  "solc": "^0.8.11",