Migrate to Xcode 16 and drop macOS 13

[cyanzhong]

• [x] Update build settings
• [x] Target 14.0 and higher
• [x] Update deprecated APIs
• [x] Remove unnecessary unchecked Sendable
• [x] Possible new API adoption
• [ ] Make sure GitHub actions run
• [ ] Update links in README
• [ ] Tag macos-13 compatible version