build(deps): bump proc-macro2 from 1.0.86 to 1.0.89

[dependabot[bot]]

Bumps proc-macro2 from 1.0.86 to 1.0.89.

Release notes

Sourced from proc-macro2's releases.

1.0.89

• Ensure OUT_DIR is left with deterministic contents after build script execution (#474)

1.0.88

• Return accurate line and column from Span::start and Span::end inside proc macros on nightly (#472)

1.0.87

• Check valid punctuation character in Punct::new (#470)

Commits

• 671d87d Release 1.0.89
• 9574d98 Merge pull request #474 from dtolnay/outdir
• 3e8962c Clean up dep-info files from OUT_DIR
• 6b3395a Release 1.0.88
• faee27e Merge pull request #472 from dtolnay/startend
• 44f8ff2 Restore nightly behavior of Span::start and Span::end
• 50b477d Release 1.0.87
• f0b6802 Merge pull request #471 from dtolnay/punctnew
• 98ea261 Check valid punctuation character in Punct::new
• d60aaad Ignore missing_panics_doc pedantic clippy lint
• Additional commits viewable in compare view

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