This pull request includes updates to dependencies and some code restructuring to improve compatibility and maintainability. The most important changes include upgrading the alloy dependency and restructuring imports in the tap_core/src/signed_message.rs file.

Dependency updates:

• Cargo.toml: Upgraded alloy dependency from version 0.5.4 to 0.6.

New version compatibility changes:

• tap_core/src/signed_message.rs: Restructured imports to use PrimitiveSignature from alloy::primitives and adjusted other related imports.