Bump System.Text.Json from 6.0.0 to 8.0.4 in /Guan (#58)

Bumps System.Text.Json from 6.0.0 to 8.0.4.

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Guan/Guan.csproj

@@ -3,6 +3,6 @@
     <TargetFramework>netstandard2.0</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
-	<PackageReference Include="System.Text.Json" Version="6.0.0" />
+	<PackageReference Include="System.Text.Json" Version="8.0.4" />
   </ItemGroup>
 </Project>