Bump log4net from 2.0.8 to 2.0.10 in /src/Libraries/SmartStore.Core

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)

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

Author: dependabot[bot]

src/Libraries/SmartStore.Core/packages.config

@@ -5,7 +5,7 @@
   <package id="Autofac.Mvc5" version="5.0.0" targetFramework="net472" />
   <package id="EntityFramework" version="6.4.4" targetFramework="net472" />
   <package id="HtmlSanitizer" version="4.0.205" targetFramework="net461" />
-  <package id="log4net" version="2.0.8" targetFramework="net452" />
+  <package id="log4net" version="2.0.10" targetFramework="net452" />
   <package id="Microsoft.AspNet.Mvc" version="5.2.7" targetFramework="net461" />
   <package id="Microsoft.AspNet.Razor" version="3.2.7" targetFramework="net461" />
   <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net461" />