Update Rust crate proc-macro2 to 1.0.67

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
proc-macro2	workspace.dependencies	patch	1.0.51 -> 1.0.67

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Release Notes

dtolnay/proc-macro2 (proc-macro2)

v1.0.67

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• Special handling for the (/*ERROR*/) placeholder that rustc uses for macros that fail to expand (#​405)

v1.0.66

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• Raise required compiler from Rust 1.31 to 1.56

v1.0.65

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• Documentation improvements

v1.0.64

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• Fix parsing of bare \r in between tokens (#​399)

v1.0.63

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• Parse c"…" c-string literals (tracking issue: https://github.com/rust-lang/rust/issues/105723)

v1.0.62

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yanked

v1.0.61

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• Stricter parsing of whitespace in cooked string literals and between tokens (#​392, #​393)

v1.0.60

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• Eliminate uses of unstable proc_macro::Span::before/after (#​391)

v1.0.59

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• Enable proc_macro support on wasm targets (#​388)

v1.0.58

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• Make rustc version detection more robust by compiling against modernest stable features (#​384)

v1.0.57

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• Disable nightly-only start()/end() implementation on Span while the upstream API is iterated on (#​383, https://github.com/rust-lang/rust/pull/111571)

v1.0.56

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• Circumvent clippy::octal_escapes lint inside generated string and byte-string literals (#​363, #​380)
• Provide RefUnwindSafe impls for compilers older than 1.58 (#​382)

v1.0.55

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• Set a meaningful Span for literals produced via the FromStr impl of Literal (#​378)
• Implement Literal::subspan in non-macro contexts when "span-locations" feature is enabled (#​379)

v1.0.54

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• Performance improvement to "span-locations" feature (#​373)
• Fix unbounded memory usage when calling proc-macro2's parser from a fuzzer (#​374)

v1.0.53

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• Add support for Rust 1.66's source_text() method (#​350)

v1.0.52

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• Add Group::delim_span (#​366)

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