Prerequisites

• Run all flutter/packages macOS tests manually on macOS 14.5 bot #148869
• Ensure no open issues in ☂️ Tracking issue for any infra or test failures with macOS 14 #148882 under flutter/packages

https://github.com/flutter/packages/blob/main/.ci.yaml

- os: Mac-13
+ os: Mac-13|Mac-14

Do not update the following tests to Mac-14 until #149618 is landed in stable and stable version has been rolled into packages:

• Mac_arm64 macos_platform_tests stable - packages
• Mac_arm64 custom_package_tests stable