Disable NU1903 warning for Microsoft.Build

It has ExcludeAssets="runtime" anyway, meaning that's it's not copied into the build output directory. Microsoft.Build.Locator is used to use the MSBuild instance from the machine where nugraph is run.

Author: 0xced

src/nugraph/nugraph.csproj

@@ -47,7 +47,7 @@
     <PackageReference Include="Espresso3389.HttpStream" Version="2.0.76" />
     <PackageReference Include="Microsoft.Bcl.Memory" Version="9.0.9" />
     <!-- 17.11.31 is the latest version that supports .NET 8, starting with version 17.12.6, only .NET 9 is supported -->
-    <PackageReference Include="Microsoft.Build" Version="[17.11.31,17.12.6)" ExcludeAssets="runtime" />
+    <PackageReference Include="Microsoft.Build" Version="[17.11.31,17.12.6)" ExcludeAssets="runtime" NoWarn="NU1903" />
     <PackageReference Include="Microsoft.Build.Locator" Version="1.10.2" />
     <PackageReference Include="MinVer" Version="6.0.0" PrivateAssets="all" />
     <PackageReference Include="NuGet.ProjectModel" Version="6.14.0" />