update nuget test

Author: chtenb

NugetOrgTests/Rubjerg.Graphviz.NugetOrgTest/Rubjerg.Graphviz.NugetOrgTest.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <OutputType>Library</OutputType>
@@ -18,7 +18,7 @@
 
   <ItemGroup>
     <PackageReference Include="Rubjerg.Graphviz">
-      <Version>3.0.2</Version>
+      <Version>3.0.3</Version>
     </PackageReference>
     <PackageReference Include="NUnit.ConsoleRunner">
       <Version>3.18.3</Version>