Bump UmbracoCms.Core from 8.2.3 to 8.5.4 in /src/Articulate

Bumps [UmbracoCms.Core](https://github.com/umbraco/umbraco-cms) from 8.2.3 to 8.5.4.
- [Release notes](https://github.com/umbraco/umbraco-cms/releases)
- [Commits](umbraco/Umbraco-CMS@release-8.2.3...release-8.5.4)

---
updated-dependencies:
- dependency-name: UmbracoCms.Core
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

src/Articulate/packages.config

@@ -63,7 +63,7 @@
   <package id="System.Threading.Tasks.Dataflow" version="4.9.0" targetFramework="net472" />
   <package id="System.ValueTuple" version="4.5.0" targetFramework="net472" />
   <package id="Umbraco.SqlServerCE" version="4.0.0.1" targetFramework="net472" />
-  <package id="UmbracoCms.Core" version="8.2.3" targetFramework="net472" />
+  <package id="UmbracoCms.Core" version="8.5.4" targetFramework="net472" />
   <package id="UmbracoCms.Web" version="8.2.3" targetFramework="net472" />
   <package id="xmlrpcnet" version="3.0.0.266" targetFramework="net472" />
   <package id="xmlrpcnet-server" version="3.0.0.266" targetFramework="net472" />