chore(deps): update rust to nightly-2026-06-07 (#420)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [rust](https://rust-lang.org/)
([source](https://redirect.github.com/rust-lang/rust),
[changelog](https://redirect.github.com/rust-lang/rust/blob/main/RELEASES.md))
| toolchain | patch | `nightly-2026-05-24` → `nightly-2026-06-07` |

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rust-toolchain.toml

@@ -2,5 +2,5 @@
 # Needed nightly features:
 # - cargo `Z-bindeps` to build and embed preload shared libraries as dependencies of fspy
 # - `windows_process_extensions_main_thread_handle` to get the main thread handle for Detours injection
-channel = "nightly-2026-05-24"
+channel = "nightly-2026-06-07"
 profile = "default"