onnxruntime

f46113d7 - Use fixed iOS simulator runtime version in mac.yml iphone_simulator job (#25794)

Use fixed iOS simulator runtime version in mac.yml iphone_simulator job (#25794) ### Description <!-- Describe your changes. --> Set iOS simulator runtime version to 18.5 in mac.yml iphone_simulator job. This job uses Xcode 16.4. According to this table, the corresponding simulator SDK version is 18.5. https://github.com/actions/runner-images/blob/da7977bf2699f44e70b7d3c3352dedb0da38db9c/images/macos/macos-15-arm64-Readme.md?plain=1#L181 ### Motivation and Context <!-- - Why is this change required? What problem does it solve? - If it fixes an open issue, please link to the issue here. --> Address intermittent CI build timeouts.