Bump log4net from 2.0.8 to 2.0.10 in /src/Our.Umbraco.AuthU

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]

src/Our.Umbraco.AuthU/packages.config

@@ -10,7 +10,7 @@
   <package id="LightInject" version="5.4.0" targetFramework="net472" />
   <package id="LightInject.Annotation" version="1.1.0" targetFramework="net472" />
   <package id="LightInject.Web" version="2.0.0" targetFramework="net472" />
-  <package id="log4net" version="2.0.8" targetFramework="net452" />
+  <package id="log4net" version="2.0.10" targetFramework="net452" />
   <package id="Log4Net.Async" version="2.0.4" targetFramework="net452" />
   <package id="Lucene.Net" version="2.9.4.1" targetFramework="net452" />
   <package id="Markdown" version="1.14.7" targetFramework="net452" />