Enable the Enhanced Security Capability

The [Enhanced Security capability](https://developer.apple.com/documentation/Xcode/enabling-enhanced-security-for-your-app) in Xcode enables a set of features that make apps more secure. Particularly of note is Apple's [Memory Integrity Enforcement](https://security.apple.com/blog/memory-integrity-enforcement/) that protects against memory safety vulnerabilities.

I think it would be beneficial to work toward enabling this capability and as many of its security features as possible, especially since UTM is an app that many people trust with very sensitive use cases.