No build warnings when using deprecated NSBezelStyles

### Apple platform

macOS

### Framework version

net9.0-macos26.0

### Affected platform version

.NET 9.0.9

### Description

Many values of the `NSBezelStyle` enum are deprecated, but there are no warnings in the IDE or when building.
According to the Apple docs, some enums are deprecated since 10.14, other are (or will be) deprecated with macOS 26.1.

The enum values also seem to have `UnsupportedOSPlatform` attributes on them, but they don't work?

I am currently using net9.0-macos26.0 with Xcode 26, but I think the issue was present before with Xcode 16.4 also

### Steps to Reproduce

```
var btn = new NSButton();
// https://developer.apple.com/documentation/appkit/nsroundeddisclosurebezelstyle
btn.BezelStyle = NSBezelStyle.RoundedDisclosure;
// https://developer.apple.com/documentation/appkit/nsbutton/bezelstyle-swift.enum/inline?language=objc
btn.BezelStyle = NSBezelStyle.Inline;
```