build(deps): update syn requirement from 1.0.14 to 2.0.51

[dependabot[bot]]

Updates the requirements on syn to permit the latest version.

Release notes

Sourced from syn's releases.

2.0.51

• Resolve non_local_definitions warnings in generated code under rustc 1.78-nightly

Commits

• 5e15a9b Release 2.0.51
• 7e0d4e1 Resolve non_local_definitions warning in debug impls
• 8667ad9 Ignore module_name_repetitions pedantic clippy lint in codegen
• 1fc3200 Update test suite to nightly-2024-02-26
• 07a2065 Update test suite to nightly-2024-02-23
• 0dae015 Release 2.0.50
• 2b493c3 Update location of Pat variant aliases
• 07a435d Fix doc links now that crate::* is no longer imported
• 713f932 Eliminate glob imports
• 6eb82a9 Eliminate glob imports from codegen
• Additional commits viewable in compare view

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