Fix Xamarin.Jetbrains.Annotations conflicting with `Jetbrains.Annot…

…ations`

This conflict was most noticeable when using `[NotNull]` in osu!
ppy/osu@9c22fa3

This doesn't fix the conflict in o!f.Android, but it does fix it for downstream projects.
If a fix is needed for o!f, PackageReference Aliases can be used.

More info: xamarin/AndroidX#885

osu.Framework.Android/osu.Framework.Android.csproj

@@ -19,6 +19,6 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="ppy.SDL3-CS.Android" Version="2024.418.1" />
-    <PackageReference Include="Xamarin.AndroidX.Window" Version="1.2.0.1" />
+    <PackageReference Include="Xamarin.AndroidX.Window" Version="1.2.0.1" PrivateAssets="compile" />
   </ItemGroup>
 </Project>