Add explicit System.Text.Json dep for net4 target only (#616)

Author: mpreyskurantov

net/DevExtreme.AspNet.Data/DevExtreme.AspNet.Data.csproj

@@ -22,16 +22,13 @@
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net461' ">
     <Reference Include="Microsoft.CSharp" />
+    <PackageReference Include="System.Text.Json" Version="6.0.9" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net6.0' ">
     <PackageReference Include="Microsoft.CSharp" Version="4.4.0" />
   </ItemGroup>
 
-  <ItemGroup>
-    <PackageReference Include="System.Text.Json" Version="6.0.0" />
-  </ItemGroup>
-
   <ItemGroup>
     <Service Include="{508349b6-6b84-4df5-91f0-309beebad82d}" />
     <None Update="Types\AnonType.Generated.tt">