Bump System.Text.Json in /src/libs/SoloX.GeneratorTools.Core.CSharp

Bumps System.Text.Json from 8.0.1 to 8.0.4.

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

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

src/libs/SoloX.GeneratorTools.Core.CSharp/SoloX.GeneratorTools.Core.CSharp.csproj

@@ -35,7 +35,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.CodeAnalysis" Version="4.8.0" />
-    <PackageReference Include="System.Text.Json" Version="8.0.1" />
+    <PackageReference Include="System.Text.Json" Version="8.0.4" />
   </ItemGroup>
 
   <ItemGroup>