Update eth-simple-keyring to v6.0.0

[legobeat]

Blocked by

• 6.0.0 eth-simple-keyring#154
  • deps: @metamask/eth-sig-util@^6.0.1->^7.0.0 eth-simple-keyring#156
  • Increase minimum Node.js version to 16; recommended to 18 eth-simple-keyring#152
    • 5.1.0 eth-simple-keyring#151
      • deps: @metamask/utils@^5.0.0->^5.0.2 eth-simple-keyring#155
        • Add validateMessage option to signMessage eth-simple-keyring#148
      • deps: @metamask/eth-sig-util@^5.0.2->^6.0.1 eth-simple-keyring#149
• 13.0.1 #266
  • devDeps: ethereumjs-wallet@^1.0.2 -> @ethereumjs/wallet@^2.0.0 #263

Blocking

• 14.0.0 #265
  • deps: Bump @metamask/{eth-json-rpc-provider,rpc-errors}  core#1653
    • deps: Update @metamask/utils and @metamask/rpc-errors  snaps#1728
      • update dependencies in https://github.com/MetaMask/keyring-api/

[legobeat]

resolved in #273