Bump proc-macro2 from 1.0.76 to 1.0.80

[dependabot[bot]]

Bumps proc-macro2 from 1.0.76 to 1.0.80.

Release notes

Sourced from proc-macro2's releases.

1.0.80

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

1.0.79

• Clean up dead code

1.0.78

• Expose Span::byte_range (#442)

1.0.77

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

Commits

• da51f8d Release 1.0.80
• 392fa6c Ignore needless_pass_by_value pedantic clippy lint in test
• 1ff5c1f Ignore needless_raw_string_hashes pedantic clippy lint in test
• 0c9449e Import some Literal tests from libproc_macro
• 28c87ad Add tests of negative literal construction
• c61f5db Add some tests of cstr raw literals
• d50dcd9 Merge pull request #450 from dtolnay/cstr
• 70a804b Add Literal::c_string constructor
• 45730bc Adjust Literal constructor argument names to match those in libproc_macro
• 26d1d3f Merge pull request #449 from dtolnay/bytechar
• Additional commits viewable in compare view

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