Bump log4net from 2.0.3 to 2.0.10

Bumps [log4net](https://github.com/apache/logging-log4net) from 2.0.3 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](https://github.com/apache/logging-log4net/commits/rel/2.0.10)

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

packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="log4net" version="2.0.3" targetFramework="net40" />
+  <package id="log4net" version="2.0.10" targetFramework="net40" />
   <package id="OpenTK" version="1.1.1589.5942" targetFramework="net40" />
   <package id="OpenTK.GLControl" version="1.1.1589.5942" targetFramework="net40" />
   <package id="SharpDX" version="2.6.3" targetFramework="net40" />