Bump System.Text.Json from 8.0.3 to 8.0.4 in /samples/backend/csharp (#…

…67)

Bumps System.Text.Json from 8.0.3 to 8.0.4.

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

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samples/backend/csharp/ChatProtocolBackend.csproj

@@ -10,7 +10,7 @@
     <PackageReference Include="Azure.Identity" Version="1.11.4" />
     <PackageReference Include="Azure.Security.KeyVault.Secrets" Version="4.6.0" />  
     <PackageReference Include="Microsoft.SemanticKernel" Version="1.7.1" />
-    <PackageReference Include="System.Text.Json" Version="8.0.3" />
+    <PackageReference Include="System.Text.Json" Version="8.0.4" />
   </ItemGroup>
 
 </Project>