Bump System.ServiceModel.Syndication

Bumps [System.ServiceModel.Syndication](https://github.com/dotnet/runtime) from 7.0.0-preview.5.22301.12 to 7.0.0-preview.6.22324.4.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v7.0.0-preview.5.22301.12...v7.0.0-preview.6.22324.4)

---
updated-dependencies:
- dependency-name: System.ServiceModel.Syndication
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

src/LinkDotNet.Blog.Web/LinkDotNet.Blog.Web.csproj

@@ -11,7 +11,7 @@
         <PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="7.0.0-preview.5.22303.8" />
         <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.0-preview.5.22302.2" />
         <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="7.0.0-preview.5.22302.2" />
-        <PackageReference Include="System.ServiceModel.Syndication" Version="7.0.0-preview.5.22301.12" />
+        <PackageReference Include="System.ServiceModel.Syndication" Version="7.0.0-preview.6.22324.4" />
     </ItemGroup>
 
     <ItemGroup>