chore(deps): update rust crate proc-macro2 to 1.0.81

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
proc-macro2	dependencies	patch	1.0.69 -> 1.0.81

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Release Notes

dtolnay/proc-macro2 (proc-macro2)

v1.0.81

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• Documentation improvements

v1.0.80

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• Add Literal::byte_character constructor (#​449)
• Add Literal::c_string constructor #​450)

v1.0.79

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• Clean up dead code

v1.0.78

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• Expose Span::byte_range (#​442)

v1.0.77

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• Add a function to reset thread-local span data (#​438, thanks @​buchgr)

v1.0.76

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• Work around dead_code warning false positive (#​435)

v1.0.75

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• Improve error messages related to proc_macro::LexError (#​434)

v1.0.74

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• Work around improperly cached build script result by sccache (#​432)

v1.0.73

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• Documentation improvements

v1.0.72

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• Improve build script to be robust to proc_macro::Span unstable API changes

v1.0.71

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• Turn on deny(unsafe_op_in_unsafe_fn) lint

v1.0.70

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• Add #[track_caller] on Ident::new so that panics on invalid input are attributed to the caller (#​423)

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