Update log4net NuGet package

Author: peetw

Tests.NHibernate.Spatial/Tests.NHibernate.Spatial.csproj

@@ -49,7 +49,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="log4net" Version="2.0.8" />
+    <PackageReference Include="log4net" Version="2.0.11" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.1.1" />
     <PackageReference Include="NUnit" Version="3.12.0" />
   </ItemGroup>