Bump to xamarin/xamarin-android-binutils/L_18.1.6-8.0.0@97b574b (#8969)

Context: https://discourse.llvm.org/t/18-1-5-released/78740
Context: https://discourse.llvm.org/t/18-1-6-released/79068

Changes: dotnet/android-native-tools@L_18.1.4-8.0.0...L_18.1.6-8.0.0

  * dotnet/android-native-tools@97b574b: Bump to LLVM 18.1.6 (dotnet/android-native-tools#28)
  * dotnet/android-native-tools@1035257: [s360] Ignore irrelevant LLVM+Python warnings (dotnet/android-native-tools#27)
  * dotnet/android-native-tools@5d8ce9b: [ci] Use dynamic names for log artifacts (dotnet/android-native-tools#26)

Bump LLVM to 18.1.6.

There are no changes in the above announcements that are important to
us.  Simply tracking the latest LLVM 18 version.

There are no more planned 18.1.x releases, but there could be one if
a critical issue is found.

Author: grendello

build-tools/xaprepare/xaprepare/ConfigAndData/Configurables.cs

@@ -15,7 +15,7 @@ namespace Xamarin.Android.Prepare
 	//
 	partial class Configurables
 	{
-		const string BinutilsVersion                = "L_18.1.4-8.0.0";
+		const string BinutilsVersion                = "L_18.1.6-8.0.0";
 
 		const string MicrosoftOpenJDK17Version      = "17.0.8";
 		const string MicrosoftOpenJDK17Release      = "17.0.8.7";