Bump System.Text.Json from 8.0.2 to 8.0.4 in /src/UnitTestEx

Bumps System.Text.Json from 8.0.2 to 8.0.4.

---
updated-dependencies:
- dependency-name: System.Text.Json
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

src/UnitTestEx/UnitTestEx.csproj

@@ -25,21 +25,21 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net6.0'">
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="6.0.27" />
-    <PackageReference Include="System.Memory.Data" Version="6.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.2" />
+    <PackageReference Include="System.Memory.Data" Version="8.0.0" />
     <PackageReference Include="System.Text.Json" Version="6.0.9" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net7.0'">
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="7.0.16" />
-    <PackageReference Include="System.Memory.Data" Version="7.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.2" />
+    <PackageReference Include="System.Memory.Data" Version="8.0.0" />
     <PackageReference Include="System.Text.Json" Version="7.0.4" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net8.0'">
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.2" />
     <PackageReference Include="System.Memory.Data" Version="8.0.0" />
-    <PackageReference Include="System.Text.Json" Version="8.0.2" />
+    <PackageReference Include="System.Text.Json" Version="8.0.4" />
   </ItemGroup>
 
   <Import Project="..\..\Common.targets" />