Bump to xamarin/xamarin-android-binutils/L_18.1.4-8.0.0@758d2e7 (#8885)

Context: https://discourse.llvm.org/t/18-1-4-released/78430

Changes: dotnet/android-native-tools@L_18.1.3-8.0.0...L_18.1.4-8.0.0

  * dotnet/android-native-tools@758d2e7: Bump to LLVM 18.1.4 (dotnet/android-native-tools#25)
  * dotnet/android-native-tools@cea94b2: [ci] Build on Ubuntu 20.04 LTS (dotnet/android-native-tools#24)

On Linux, build the binaries on Ubuntu 20.04 LTS, to avoid:

	[llc stderr] /mnt/vss/_work/1/s/bin/Release/dotnet/packs/Microsoft.Android.Sdk.Linux/34.0.101/tools/Linux/binutils/bin/llc:
	/lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by /mnt/vss/_work/1/s/bin/Release/dotnet/packs/Microsoft.Android.Sdk.Linux/34.0.101/tools/Linux/binutils/bin/llc)

Bump to binutils based on LLVM 18.1.4.

There isn't anything directly interesting for us in this LLVM release.
Simply tracking the current version of the toolchain.

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

@@ -15,7 +15,7 @@ namespace Xamarin.Android.Prepare
 	//
 	partial class Configurables
 	{
-		const string BinutilsVersion                = "L_18.1.3-8.0.0";
+		const string BinutilsVersion                = "L_18.1.4-8.0.0";
 
 		const string MicrosoftOpenJDK17Version      = "17.0.8";
 		const string MicrosoftOpenJDK17Release      = "17.0.8.7";