Update Rust crate proc-macro2 to v1.0.94 (#26612)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [proc-macro2](https://redirect.github.com/dtolnay/proc-macro2) |
workspace.dependencies | patch | `1.0.93` -> `1.0.94` |

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### Release Notes

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

###
[`v1.0.94`](https://redirect.github.com/dtolnay/proc-macro2/releases/tag/1.0.94)

[Compare
Source](https://redirect.github.com/dtolnay/proc-macro2/compare/1.0.93...1.0.94)

-   Documentation improvements

</details>

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Release Notes:

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