cocoa: Remove deprecated CVDisplayLinkCreateWithCGDisplay() calls

As of commit ea9cdbcf when building on macOS 15 we get:

../../ui/cocoa.m:662:14: error: 'CVDisplayLinkCreateWithCGDisplay' is deprecated: first deprecated in macOS 15.0 - use NSView.displayLink(target:selector:), NSWindow.displayLink(target:selector:), or NSScreen.displayLink(target:selector:)  [-Werror,-Wdeprecated-declarations]
  662 |         if (!CVDisplayLinkCreateWithCGDisplay(display, &displayLink)) {
      |              ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/CoreVideo.framework/Headers/CVDisplayLink.h:89:20: note: 'CVDisplayLinkCreateWithCGDisplay' has been explicitly marked deprecated here
   89 | CV_EXPORT CVReturn CVDisplayLinkCreateWithCGDisplay(
      |                    ^
../../ui/cocoa.m:663:29: error: 'CVDisplayLinkGetNominalOutputVideoRefreshPeriod' is deprecated: first deprecated in macOS 15.0 - use NSView.displayLink(target:selector:), NSWindow.displayLink(target:selector:), or NSScreen.displayLink(target:selector:)  [-Werror,-Wdeprecated-declarations]
  663 |             CVTime period = CVDisplayLinkGetNominalOutputVideoRefreshPeriod(displayLink);
      |                             ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/CoreVideo.framework/Headers/CVDisplayLink.h:182:18: note: 'CVDisplayLinkGetNominalOutputVideoRefreshPeriod' has been explicitly marked deprecated here
  182 | CV_EXPORT CVTime CVDisplayLinkGetNominalOutputVideoRefreshPeriod( CVDisplayLinkRef CV_NONNULL displayLink );
      |                  ^
../../ui/cocoa.m:664:13: error: 'CVDisplayLinkRelease' is deprecated: first deprecated in macOS 15.0 - use NSView.displayLink(target:selector:), NSWindow.displayLink(target:selector:), or NSScreen.displayLink(target:selector:)  [-Werror,-Wdeprecated-declarations]
  664 |             CVDisplayLinkRelease(displayLink);
      |             ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/CoreVideo.framework/Headers/CVDisplayLink.h:249:16: note: 'CVDisplayLinkRelease' has been explicitly marked deprecated here
  249 | CV_EXPORT void CVDisplayLinkRelease( CV_RELEASES_ARGUMENT CVDisplayLinkRef CV_NULLABLE displayLink );
      |                ^
3 errors generated.