[deps]: Update Rust to v2025-05-08 (#250)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[rust-nightly](https://redirect.github.com/phi-ag/renovate-rust-nightly)
([source](https://rust-lang.github.io/rustup-components-history)) |
minor | `2025-01-01` -> `2025-05-08` |

---

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---

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rust-toolchain.toml

@@ -5,4 +5,4 @@ profile = "minimal"
 
 # The following is not part of the rust-toolchain.toml format,
 # but is used by our Renovate config to manage nightly versions.
-nightly-channel = "nightly-2025-01-01"
+nightly-channel = "nightly-2025-05-08"