fix: Update src/Mapster.Tool.Tests/Mapster.Tool.Tests.csproj

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

Author: DocSvartz

src/Mapster.Tool.Tests/Mapster.Tool.Tests.csproj

@@ -4,7 +4,7 @@
         <TargetFrameworks>net10.0;net9.0;net8.0</TargetFrameworks>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
-
+    <IsTestProject>true</IsTestProject>
         <IsPackable>false</IsPackable>
     </PropertyGroup>