Update Rust crate rustc_version to 0.4.1 (#346)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [rustc_version](https://redirect.github.com/djc/rustc-version-rs) |
dev-dependencies | patch | `0.4.0` -> `0.4.1` |

---

### Release Notes

<details>
<summary>djc/rustc-version-rs (rustc_version)</summary>

###
[`v0.4.1`](https://redirect.github.com/djc/rustc-version-rs/releases/tag/v0.4.1):
0.4.1

[Compare
Source](https://redirect.github.com/djc/rustc-version-rs/compare/v0.4.0...v0.4.1)

#### What's Changed

- respect RUSTC_WRAPPER env var by
[@&#8203;hkBst](https://redirect.github.com/hkBst) in
[https://github.com/djc/rustc-version-rs/pull/46](https://redirect.github.com/djc/rustc-version-rs/pull/46)
- bump version number: v0.4.1 by
[@&#8203;RalfJung](https://redirect.github.com/RalfJung) in
[https://github.com/djc/rustc-version-rs/pull/48](https://redirect.github.com/djc/rustc-version-rs/pull/48)
- Prepare 0.4.1 by [@&#8203;djc](https://redirect.github.com/djc) in
[https://github.com/djc/rustc-version-rs/pull/49](https://redirect.github.com/djc/rustc-version-rs/pull/49)

</details>

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target-spec/Cargo.toml

@@ -29,7 +29,7 @@ unicode-ident = "1.0.12"
 guppy-workspace-hack.workspace = true
 
 [dev-dependencies]
-rustc_version = "0.4.0"
+rustc_version = "0.4.1"
 test-case = "3.3.1"
 toml = "0.5.11"