Bump proc-macro2 from 1.0.70 to 1.0.73

[dependabot[bot]]

Bumps proc-macro2 from 1.0.70 to 1.0.73.

Release notes

Sourced from proc-macro2's releases.

1.0.73

• Documentation improvements

1.0.72

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

1.0.71

• Turn on deny(unsafe_op_in_unsafe_fn) lint

Commits

• 4dce5d7 Release 1.0.73
• 708540b Merge pull request #431 from dtolnay/doccfg
• 014fa82 Restore documented cfg on LineColumn
• df4fa83 Merge pull request #430 from dtolnay/nightlyci
• 75897cf Make CI verify that proc_macro_span works in latest nightly
• 643cb89 Release 1.0.72
• 3db1977 Merge pull request #429 from dtolnay/probe
• a961bae Test for the specific proc_macro_span API expected by proc-macro2
• 784ae2e Merge pull request #428 from dtolnay/cargoenvvar
• 8ade7da Require cargo promised environment variables to be present
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (46e3c39) 91.65% compared to head (f40b148) 88.66%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #200 +/- ## ========================================== - Coverage 91.65% 88.66% -3.00% ========================================== Files 14 14 Lines 1126 1076 -50 ========================================== - Hits 1032 954 -78 - Misses 94 122 +28 ```

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[dependabot[bot]]

Superseded by #201.