Bump System.Text.Json from 9.0.0 to 9.0.4 in /src/webapp01

Bumps [System.Text.Json](https://github.com/dotnet/runtime) from 9.0.0 to 9.0.4.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v9.0.0...v9.0.4)

---
updated-dependencies:
- dependency-name: System.Text.Json
  dependency-version: 9.0.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/webapp01/webapp01.csproj

@@ -13,7 +13,7 @@
     <PackageReference Include="Azure.Identity" Version="1.13.2" />
     <PackageReference Include="Microsoft.Data.SqlClient" Version="5.1.3" />
     <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.21.0" />
-    <PackageReference Include="System.Text.Json" Version="8.0.4" />
+    <PackageReference Include="System.Text.Json" Version="9.0.4" />
   </ItemGroup>
 
 </Project>