fix: extension bug report of 30473, user receive error when sign typed data v4 with string value of salt.

[dawnseeker8]

This PR is to fix the extension bug 30473

Basically the issue was caused by domain salt was defined as string in client DApp, and @metamask/eth-sig-util library we used define salt as arrayType. which cause miss match with previous code of salt value.

This code has been tested with client dapp and our e2e test-dapp to confirm it will work for both.

Examples

[dawnseeker8]

@metamaskbot publish-preview

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Preview builds have been published. See these instructions (from the core monorepo) for more information about preview builds.

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{
  "@metamask-previews/keyring-api": "17.2.1-a272752",
  "@metamask-previews/eth-hd-keyring": "12.1.0-a272752",
  "@metamask-previews/eth-ledger-bridge-keyring": "10.0.0-a272752",
  "@metamask-previews/eth-simple-keyring": "10.0.0-a272752",
  "@metamask-previews/eth-trezor-keyring": "8.0.0-a272752",
  "@metamask-previews/keyring-internal-api": "6.0.0-a272752",
  "@metamask-previews/keyring-internal-snap-client": "4.0.1-a272752",
  "@metamask-previews/eth-snap-keyring": "12.0.0-a272752",
  "@metamask-previews/keyring-snap-client": "4.0.1-a272752",
  "@metamask-previews/keyring-snap-sdk": "3.1.0-a272752",
  "@metamask-previews/keyring-utils": "3.0.0-a272752"
}