ci: bump Xcode to 13.4.1

Author: tido64

.circleci/config.yml

@@ -24,13 +24,13 @@ default config for macOS: &macos_defaults
   <<: *defaults
   resource_class: 'medium'
   macos:
-    xcode: '13.2.1'
+    xcode: '13.4.1'
 
 config for macOS (android): &macos_defaults_android
   <<: *defaults
   resource_class: 'medium'
   macos:
-    xcode: '11.5.0'
+    xcode: '13.4.1'
 
 default config for android apk builds: &android_defaults
   <<: *defaults