Rollup merge of #62885 - atouchet:macos, r=alexcrichton
Rollup merge of #62885 - atouchet:macos, r=alexcrichton

Change "OSX" to "macOS"

Apple no longer uses the OS X branding.

aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust