Update to MAUI .NET 9 Preview 6 manifests (#42077)

Context: https://github.com/dotnet/maui/releases/tag/9.0.0-preview.6.24327.7
Context: https://github.com/dotnet/android/releases/tag/34.99.0-preview.6.340
Context: https://github.com/xamarin/xamarin-macios/releases/tag/dotnet-9.0.1xx-preview6-9714

These released with .NET 9 Preview 6.

Author: jonathanpeppers

eng/Versions.props

@@ -355,13 +355,13 @@
   <PropertyGroup Label="Workload manifest package versions">
     <AspireFeatureBand>8.0.100</AspireFeatureBand>
     <MicrosoftNETSdkAspireManifest80100PackageVersion>8.0.1</MicrosoftNETSdkAspireManifest80100PackageVersion>
-    <MauiFeatureBand>9.0.100-preview.1</MauiFeatureBand>
-    <MauiWorkloadManifestVersion>9.0.0-preview.1.9973</MauiWorkloadManifestVersion>
-    <XamarinAndroidWorkloadManifestVersion>34.99.0-preview.1.151</XamarinAndroidWorkloadManifestVersion>
-    <XamarinIOSWorkloadManifestVersion>17.2.9088-net9-p1</XamarinIOSWorkloadManifestVersion>
-    <XamarinMacCatalystWorkloadManifestVersion>17.2.9088-net9-p1</XamarinMacCatalystWorkloadManifestVersion>
-    <XamarinMacOSWorkloadManifestVersion>14.2.9088-net9-p1</XamarinMacOSWorkloadManifestVersion>
-    <XamarinTvOSWorkloadManifestVersion>17.2.9088-net9-p1</XamarinTvOSWorkloadManifestVersion>
+    <MauiFeatureBand>9.0.100-preview.6</MauiFeatureBand>
+    <MauiWorkloadManifestVersion>9.0.0-preview.6.24327.7</MauiWorkloadManifestVersion>
+    <XamarinAndroidWorkloadManifestVersion>34.99.0-preview.6.340</XamarinAndroidWorkloadManifestVersion>
+    <XamarinIOSWorkloadManifestVersion>17.2.9714-net9-p6</XamarinIOSWorkloadManifestVersion>
+    <XamarinMacCatalystWorkloadManifestVersion>17.2.9714-net9-p6</XamarinMacCatalystWorkloadManifestVersion>
+    <XamarinMacOSWorkloadManifestVersion>14.2.9714-net9-p6</XamarinMacOSWorkloadManifestVersion>
+    <XamarinTvOSWorkloadManifestVersion>17.2.9714-net9-p6</XamarinTvOSWorkloadManifestVersion>
     <!-- Workloads from dotnet/emsdk -->
     <MicrosoftNETWorkloadEmscriptenCurrentManifest90100TransportPackageVersion>9.0.0-preview.7.24352.2</MicrosoftNETWorkloadEmscriptenCurrentManifest90100TransportPackageVersion>
     <EmscriptenWorkloadManifestVersion>$(MicrosoftNETWorkloadEmscriptenCurrentManifest90100TransportPackageVersion)</EmscriptenWorkloadManifestVersion>