fix(deps): update dependency @metamask/eth-sig-util to v4.0.1

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@metamask/eth-sig-util	4.0.0 -> 4.0.1

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Release Notes

MetaMask/eth-sig-util (@​metamask/eth-sig-util)

v4.0.1

Compare Source

Fixed

• Fix mistake in TYPED_MESSAGE_SCHEMA (#​243)
  • The schema changed in v4 in a way that accidentally disallowed "reference types" (i.e. custom types) apart from the primary type. Reference types are now once again allowed.

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