Bump macOS minimum deployment target to macOS 13

[ChangeLog][macOS] The minimum deployment target is now macOS 13.

Change-Id: I92f79dd94b8183c8dd4e7a9a69e2312ae0b9cda1
Reviewed-by: Volker Hilsheimer <[email protected]>

Author: torarnv

.cmake.conf

@@ -51,7 +51,7 @@ set(QT_MAX_NEW_POLICY_CMAKE_VERSION_QT_APPLE "3.21")
 set(QT_SUPPORTED_MIN_MACOS_SDK_VERSION "14")
 set(QT_SUPPORTED_MAX_MACOS_SDK_VERSION "15")
 set(QT_SUPPORTED_MIN_MACOS_XCODE_VERSION "15")
-set(QT_SUPPORTED_MIN_MACOS_VERSION "12")
+set(QT_SUPPORTED_MIN_MACOS_VERSION "13")
 set(QT_SUPPORTED_MAX_MACOS_VERSION_TESTED "15")
 
 set(QT_SUPPORTED_MIN_IOS_SDK_VERSION "17")