build(deps): update objc2 requirement from 0.5.2 to 0.6.0

Updates the requirements on [objc2](https://github.com/madsmtm/objc2) to permit the latest version.
- [Commits](madsmtm/objc2@objc-0.5.2...objc-0.6.0)

---
updated-dependencies:
- dependency-name: objc2
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -53,7 +53,7 @@ features = ["Win32_Graphics_Gdi", "Win32_UI_Shell", "Win32_UI_WindowsAndMessagin
 bytemuck = { version = "1.12.3", features = ["extern_crate_alloc"] }
 core-graphics = "0.24.0"
 foreign-types = "0.5.0"
-objc2 = "0.5.2"
+objc2 = "0.6.0"
 objc2-foundation = { version = "0.2.2", features = [
     "NSDictionary",
     "NSGeometry",