updated projects to net6.0

src/Demo1/Demo1.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <PublishReadyToRun>false</PublishReadyToRun>
     <TieredCompilation>false</TieredCompilation>
   </PropertyGroup>

src/Demo2/Demo2.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <PublishReadyToRun>false</PublishReadyToRun>
     <TieredCompilation>false</TieredCompilation>
   </PropertyGroup>

src/Demo3/Demo3.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <PublishReadyToRun>false</PublishReadyToRun>
     <TieredCompilation>false</TieredCompilation>
   </PropertyGroup>

src/MonoSceneViewer/MonoSceneViewer.csproj

@@ -1,8 +1,8 @@
-<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net6.0-windows</TargetFramework>
     <UseWPF>true</UseWPF>
   </PropertyGroup>