chore(deps): update rust crate proc-macro2 to 1.0.81 (#126)

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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 | `1.0.79` -> `1.0.81` |

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### Release Notes

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

### [`v1.0.81`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.81)

[Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.80...1.0.81)

-   Documentation improvements

### [`v1.0.80`](https://togithub.com/dtolnay/proc-macro2/releases/tag/1.0.80)

[Compare Source](https://togithub.com/dtolnay/proc-macro2/compare/1.0.79...1.0.80)

-   Add `Literal::byte_character` constructor ([#&#8203;449](https://togithub.com/dtolnay/proc-macro2/issues/449))
-   Add `Literal::c_string` constructor [#&#8203;450](https://togithub.com/dtolnay/proc-macro2/issues/450))

</details>

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Cargo.toml

@@ -66,7 +66,7 @@ clap = { version = "4.5.4", features = ["derive"] }
 regex = "1.10.4"
 syn = { version = "2.0.58", features = ["full"] }
 quote = "1.0.36"
-proc-macro2 = "1.0.79"
+proc-macro2 = "1.0.81"
 assert_cmd = "2.0.14"
 predicates = "3.1.0"
 normpath = "1.2"