build(deps): bump proc-macro2 from 1.0.71 to 1.0.74 in /backend

[dependabot[bot]]

Bumps proc-macro2 from 1.0.71 to 1.0.74.

Release notes

Sourced from proc-macro2's releases.

1.0.74

• Work around improperly cached build script result by sccache (#432)

1.0.73

• Documentation improvements

1.0.72

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

Commits

• 6cb41f8 Release 1.0.74
• 506a2a5 Merge pull request #432 from dtolnay/depinfo
• 68846e3 Include env-dep:RUSTC_BOOTSTRAP in dep-info for sccache
• 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
• 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 (c5ebb95) 38.92% compared to head (05132cf) 38.92%. Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #592 +/- ## ======================================= Coverage 38.92% 38.92% ======================================= Files 57 57 Lines 3430 3430 ======================================= Hits 1335 1335 Misses 2095 2095 ```

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[dependabot[bot]]

Superseded by #607.