Bump log4net from 2.0.8 to 2.0.10 in /source/Demos/ThemedSuggestBoxDemo

Bumps [log4net](https://github.com/apache/logging-log4net) from 2.0.8 to 2.0.10.
- [Release notes](https://github.com/apache/logging-log4net/releases)
- [Changelog](https://github.com/apache/logging-log4net/blob/master/ReleaseInstructions.txt)
- [Commits](apache/logging-log4net@rel/2.0.8...rel/2.0.10)

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Author: dependabot[bot]

source/Demos/ThemedSuggestBoxDemo/packages.config

@@ -2,5 +2,5 @@
 <packages>
   <package id="Dirkster.MLib" version="1.3.1.2" targetFramework="net452" />
   <package id="Dirkster.MWindowLib" version="1.3.0.2" targetFramework="net452" />
-  <package id="log4net" version="2.0.8" targetFramework="net452" />
+  <package id="log4net" version="2.0.10" targetFramework="net452" />
 </packages>