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 -> 1.0.81

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Release Notes

dtolnay/proc-macro2 (proc-macro2)

### [`v1.0.81`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.81) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.80...1.0.81) - Documentation improvements ### [`v1.0.80`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.80) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.79...1.0.80) - Add `Literal::byte_character` constructor ([#​449](https://togithub.com/dtolnay/proc-macro2/issues/449)) - Add `Literal::c_string` constructor [#​450](https://togithub.com/dtolnay/proc-macro2/issues/450)) ### [`v1.0.79`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.79) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.78...1.0.79) - Clean up dead code ### [`v1.0.78`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.78) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.77...1.0.78) - Expose [Span::byte_range](https://doc.rust-lang.org/1.71.0/proc_macro/struct.Span.html#method.byte_range) ([#​442](https://togithub.com/dtolnay/proc-macro2/issues/442)) ### [`v1.0.77`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.77) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.76...1.0.77) - Add a function to reset thread-local span data ([#​438](https://togithub.com/dtolnay/proc-macro2/issues/438), thanks [@​buchgr](https://togithub.com/buchgr)) ### [`v1.0.76`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.76) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.75...1.0.76) - Work around `dead_code` warning false positive ([#​435](https://togithub.com/dtolnay/proc-macro2/issues/435)) ### [`v1.0.75`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.75) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.74...1.0.75) - Improve error messages related to proc_macro::LexError ([#​434](https://togithub.com/dtolnay/proc-macro2/issues/434)) ### [`v1.0.74`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.74) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.73...1.0.74) - Work around improperly cached build script result by sccache ([#​432](https://togithub.com/dtolnay/proc-macro2/issues/432)) ### [`v1.0.73`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.73) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.72...1.0.73) - Documentation improvements ### [`v1.0.72`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.72) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.71...1.0.72) - Improve build script to be robust to proc_macro::Span unstable API changes ### [`v1.0.71`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.71) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.70...1.0.71) - Turn on `deny(unsafe_op_in_unsafe_fn)` lint ### [`v1.0.70`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.70) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.69...1.0.70) - Add #\[track_caller] on `Ident::new` so that panics on invalid input are attributed to the caller ([#​423](https://togithub.com/dtolnay/proc-macro2/issues/423)) ### [`v1.0.69`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.69) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.68...1.0.69) - Fix Span::source_text() bug causing panics or incorrect source text ([#​410](https://togithub.com/dtolnay/proc-macro2/issues/410)) ### [`v1.0.68`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.68) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.67...1.0.68) - Fix panic in Span::source_text() when source contains multibyte characters ([#​408](https://togithub.com/dtolnay/proc-macro2/issues/408)) ### [`v1.0.67`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.67) [Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.66...1.0.67) - Special handling for the `(/*ERROR*/)` placeholder that rustc uses for macros that fail to expand ([#​405](https://togithub.com/dtolnay/proc-macro2/issues/405))

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