Make package reference private

Author: bording

src/GitVersion.MsBuild/GitVersion.MsBuild.csproj

@@ -13,7 +13,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.Build.Utilities.Core" Version="$(PackageVersion_MsBuild)"/>
+        <PackageReference Include="Microsoft.Build.Utilities.Core" Version="$(PackageVersion_MsBuild)" PrivateAssets="All"/>
         <PackageReference Include="Microsoft.Win32.Registry" Version="$(PackageVersion_MicrosoftExtensions)" PrivateAssets="All"/>
         <PackageReference Include="System.Text.Json" Version="$(PackageVersion_MicrosoftJson)" PrivateAssets="All"/>
         <PackageReference Include="System.Text.Encodings.Web" Version="$(PackageVersion_MicrosoftJson)" PrivateAssets="All"/>