added proc-macro-error2 dependency

[Aditya-PS-05]

closes #1873

Summary

Added proc-macro-error-2 and removed proc-macro-error dependency.

[greptile-apps]

PR Summary

Here's my concise review of the changes:

Updated proc-macro error handling in shuttle-codegen to address security concerns by replacing unmaintained dependencies.

• Replaced proc-macro-error with proc-macro-error2 v2.0.1 in /codegen/Cargo.toml to resolve RUSTSEC-2024-0370 advisory
• Updated macro import in /codegen/src/lib.rs from proc_macro_error to proc_macro_error2::proc_macro_error
• Maintained API compatibility with existing error handling while using actively maintained dependency

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[greptile-apps]

style: proc-macro2 version 1.0.47 is quite old, consider updating to latest 1.0.x

[Aditya-PS-05]

ok

[Aditya-PS-05]

@jonaro00 , please review the pr.

[greptile-apps]

PR Summary

(updates since last review)

No major changes found since last review. The previous review already covered the key changes regarding the proc-macro dependency updates and their implications.

The changes remain focused on:

• Replacing unmaintained proc-macro-error with proc-macro-error2
• Updating proc-macro2 version
• Maintaining API compatibility

No additional review points needed as the core changes were thoroughly covered in the previous review.

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[jonaro00]

Looks good! Thanks!