Remove STJ

Author: robertcoltheart

src/Prefab/templates/prefab/build/build.csproj

@@ -8,7 +8,6 @@
   <ItemGroup>
     <PackageReference Include="Bullseye" Version="5.0.0" />
     <PackageReference Include="SimpleExec" Version="12.0.0" />
-    <PackageReference Include="System.Text.Json" Version="9.0.1" />
   </ItemGroup>
 
 </Project>