Add .NET 6.0 to EOL frameworks list

Co-authored-by: marcpopMSFT <[email protected]>

Author: 2 people

src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.EolTargetFrameworks.targets

@@ -21,10 +21,10 @@ Copyright (c) .NET Foundation. All rights reserved.
     receive servicing updates and security fixes.
   -->
   <ItemGroup>
-    <_EolNetCoreTargetFrameworkVersions Include="1.0;1.1;2.0;2.1;2.2;3.0;3.1;5.0;7.0" />
+    <_EolNetCoreTargetFrameworkVersions Include="1.0;1.1;2.0;2.1;2.2;3.0;3.1;5.0;6.0;7.0" />
   </ItemGroup>
   <PropertyGroup>
-    <_MinimumNonEolSupportedNetCoreTargetFramework>net6.0</_MinimumNonEolSupportedNetCoreTargetFramework>
+    <_MinimumNonEolSupportedNetCoreTargetFramework>net8.0</_MinimumNonEolSupportedNetCoreTargetFramework>
   </PropertyGroup>
 
   <Target Name="_CheckForEolTargetFrameworks" AfterTargets="_CheckForUnsupportedNETCoreVersion"

test/Microsoft.NET.Build.Tests/GivenThatWeWantToTargetEolFrameworks.cs

@@ -15,6 +15,7 @@ public GivenThatWeWantToTargetEolFrameworks(ITestOutputHelper log) : base(log)
         [InlineData("netcoreapp3.0")]
         [InlineData("netcoreapp3.1")]
         [InlineData("net5.0")]
+        [InlineData("net6.0")]
         [InlineData("net7.0")]
         public void It_warns_that_framework_is_out_of_support(string targetFrameworks)
         {