fix: update iOS image

Author: FabianStoll

.yamato/mobile-build-and-run.yml

@@ -70,7 +70,7 @@ mobile_test_ios_{{ project.name }}_{{ editor }}:
     name: {{ project.name }} mobile project tests - {{ editor }} on iOS
     agent:
         type: Unity::mobile::iPhone
-        image: package-ci/macos-12:v4
+        image: package-ci/macos-13:v4
         flavor: b1.medium
 
     # Skip repository cloning