Fix build errors.

Author: Dixin

Source/TransientFaultHandling.Caching.Core/TransientFaultHandling.Caching.Core.csproj

@@ -39,7 +39,7 @@
     <PackageReference Include="System.ServiceModel.Primitives" Version="4.5.3" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0' Or '$(TargetFramework)' == 'net5.0' Or '$(TargetFramework)' == 'net6.0'">
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0' Or '$(TargetFramework)' == 'net5.0' Or '$(TargetFramework)' == 'net6.0' Or '$(TargetFramework)' == 'net7.0' Or '$(TargetFramework)' == 'net8.0'">
     <PackageReference Include="System.ServiceModel.Primitives" Version="4.9.0" />
   </ItemGroup>