Bump DotNetNuke.Core from 8.0.4.226 to 9.4.0 in /R7.News.Agent

Bumps [DotNetNuke.Core](https://github.com/dnnsoftware/Dnn.Platform) from 8.0.4.226 to 9.4.0.
- [Release notes](https://github.com/dnnsoftware/Dnn.Platform/releases)
- [Commits](https://github.com/dnnsoftware/Dnn.Platform/commits/v9.4.0)

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

R7.News.Agent/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="DotNetNuke.Core" version="8.0.4.226" targetFramework="net45" />
+  <package id="DotNetNuke.Core" version="9.4.0" targetFramework="net45" />
   <package id="DotNetNuke.Web" version="8.0.4.226" targetFramework="net45" />
   <package id="DotNetNuke.Web.Deprecated" version="8.0.4.226" targetFramework="net45" />
   <package id="DotNetNuke.Web.Mvc" version="8.0.4.226" targetFramework="net45" />