Upgrade .net Core example to .net 6

Author: henon

examples/Python.Included.Example.NetCore/Program.cs

@@ -25,10 +25,10 @@ static async Task Main(string[] args)
             await Installer.SetupPython();
 
             // install pip3 for package installation
-            Installer.TryInstallPip();
+            await Installer.TryInstallPip();
 
             // download and install Spacy from the internet
-            Installer.PipInstallModule("spacy");
+            await Installer.PipInstallModule("spacy");
 
             // ok, now use pythonnet from that installation
             PythonEngine.Initialize();

examples/Python.Included.Example.NetCore/Python.Included.Example.NetCore.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\Python.Included\Python.Included.csproj" />