Obsolete in some places

Xamarin.Essentials/DeviceInfo/DeviceInfo.macos.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Runtime.InteropServices;
-using CoreFoundation;
 using Foundation;
 using ObjCRuntime;
 
@@ -28,7 +27,9 @@ namespace Xamarin.Essentials
 
             try
             {
-                return CFString.FromHandle(computerNameHandle);
+#pragma warning disable CS0618 // Type or member is obsolete
+                return NSString.FromHandle(computerNameHandle);
+#pragma warning restore CS0618 // Type or member is obsolete
             }
             finally
             {

Xamarin.Essentials/Platform/Platform.macos.cs

@@ -232,7 +232,9 @@ namespace Xamarin.Essentials
 
                 // we weren't able to work out what was happening, so try and guess
                 var typeHandle = IOPSGetProvidingPowerSourceType(infoHandle);
-                if (CFString.FromHandle(typeHandle) == kIOPMBatteryPowerKey)
+#pragma warning disable CS0618 // Type or member is obsolete
+                if (NSString.FromHandle(typeHandle) == kIOPMBatteryPowerKey)
+#pragma warning restore CS0618 // Type or member is obsolete
                     return BatteryState.Discharging;
 
                 return BatteryState.NotCharging;
@@ -297,7 +299,7 @@ namespace Xamarin.Essentials
             {
                 infoHandle = IOPSCopyPowerSourcesInfo();
                 var typeHandle = IOPSGetProvidingPowerSourceType(infoHandle);
-                switch (CFString.FromHandle(typeHandle))
+                switch (NSString.FromHandle(typeHandle))
                 {
                     case kIOPMBatteryPowerKey:
                         return BatteryPowerSource.Battery;