Chore update bolos-derive

[abenso]

Removed proc-macro-error

[gemini-code-assist]

Summary of Changes

Hello @abenso, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on updating the bolos-derive crate's dependencies and adapting its procedural macros to these changes. The most significant change is the removal of the proc-macro-error crate, along with a major version upgrade of the syn crate from 1.x to 2.x. These updates ensure the derive macros remain compatible with the latest Rust ecosystem tools and simplify the dependency tree.

Highlights

• Removal of proc-macro-error: The proc-macro-error dependency has been completely removed from the project, simplifying the dependency graph and reducing the overall footprint.
• Syn Crate Upgrade: The syn crate has been upgraded to its major version 2.x, which required adapting existing procedural macro logic to the new API.
• Dependency Updates: Other key dependencies including quote, proc-macro2, and convert_case have been updated to their latest compatible versions.
• Refactored Error Handling: Error handling within the procedural macros has been refactored to use standard Rust panic! calls instead of the proc-macro-error specific functions.
• API Adaptation for Syn 2.x: Adjustments were made across enum_init.rs, lazy_static.rs, and utils.rs to align with the API changes introduced by syn 2.x.

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