chore(deps): update rust crate proc-macro2 to v1.0.84 (#475)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [proc-macro2](https://togithub.com/dtolnay/proc-macro2) |
workspace.dependencies | patch | `1.0.83` -> `1.0.84` |

---

### Release Notes

<details>
<summary>dtolnay/proc-macro2 (proc-macro2)</summary>

###
[`v1.0.84`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.84)

[Compare
Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.83...1.0.84)

- Documentation improvements
([#&#8203;455](https://togithub.com/dtolnay/proc-macro2/issues/455),
thanks
[@&#8203;CensoredUsername](https://togithub.com/CensoredUsername))

</details>

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