Fix false positives on procedural macros of missing_inline_in_public_items lint

[ghost]

Fixes #6486.

changelog: Fix false positives on procedural macros of missing_inline_in_public_items lint.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @flip1995 (or someone else) soon.

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[flip1995]

@bors r+

Thanks!

[bors]

📌 Commit da3a573 has been approved by flip1995

[bors]

⌛ Testing commit da3a573 with merge 8222d48...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: flip1995
Pushing 8222d48 to master...