[audit] #16: Bring SybilResistanceVerifier into compliance with EIP-191

[stevieraykatz]

This PR adds address(this) to the expected signature hash.

From Spearbit:

Description
As per EIP-191 the following bytes after 1900 should be the (i.e, address(this)). This is done so that the signatures cannot be replayed across different contracts.

The SybilResistanceVerifier._makeSignatureHash currently appends the signer address after 1900.

Recommendation
Consider appending address(this) after 1900.

    keccak256(abi.encodePacked(hex"1900", address(this), ...));

[cb-heimdall]

Review Error for ricardoMogg @ 2024-06-25 17:15:14 UTC
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