macOS: fix runtime crash on macos26 "type code 'q', but found 'Q'"

Fixes #4299.

Cargo.toml

@@ -119,7 +119,7 @@ ndk = { version = "0.9.0", default-features = false }
 [target.'cfg(any(target_os = "ios", target_os = "macos"))'.dependencies]
 block2 = "0.5.1"
 core-foundation = "0.9.3"
-objc2 = "0.5.2"
+objc2 = { version = "0.5.2", features = ["relax-sign-encoding"] }
 
 [target.'cfg(target_os = "macos")'.dependencies]
 core-graphics = "0.23.1"

src/changelog/unreleased.md

@@ -39,3 +39,7 @@ The migration guide could reference other migration examples in the current
 changelog entry.
 
 ## Unreleased
+
+### Fixed
+
+- On macOS, fix crash on macOS 26 by using objc2's `relax-sign-encoding` feature.