Fix crash on macOS 26 due to objc2 signed/unsigned encoding mismatch (#71)

Author: dalehamel

Cargo.lock

@@ -79,6 +79,9 @@ version = "0.29.1"
 default-features = false
 features = ["default_fonts", "x11"]
 
+[target.'cfg(target_os = "macos")'.dependencies]
+objc2 = { version = "0.5.2", features = ["relax-sign-encoding"] }
+
 [build-dependencies]
 tonic-build = "0.11.0"