build(deps-dev): bump @metamask/eth-sig-util

Bumps [@metamask/eth-sig-util](https://github.com/MetaMask/eth-sig-util) from 7.0.1 to 8.0.0.
- [Release notes](https://github.com/MetaMask/eth-sig-util/releases)
- [Changelog](https://github.com/MetaMask/eth-sig-util/blob/main/CHANGELOG.md)
- [Commits](MetaMask/eth-sig-util@v7.0.1...v8.0.0)

---
updated-dependencies:
- dependency-name: "@metamask/eth-sig-util"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

packages/network-contracts/package.json

@@ -59,7 +59,7 @@
     "@ethersproject/keccak256": "5.7.0",
     "@ethersproject/strings": "5.7.0",
     "@ethersproject/constants": "5.7.0",
-    "@metamask/eth-sig-util": "7.0.1",
+    "@metamask/eth-sig-util": "8.0.0",
     "@nomicfoundation/hardhat-chai-matchers": "1.0.5",
     "@nomicfoundation/hardhat-toolbox": "2.0.0",
     "@opengsn/provider": "2.2.6",