Bump log4net from 2.0.8 to 2.0.10 in /src

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/MicroKnights.Log4NetAdoNetAppender.StrongName.csproj

@@ -21,19 +21,19 @@
   </PropertyGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard1.3'">
-    <PackageReference Include="log4net" Version="2.0.8" />
+    <PackageReference Include="log4net" Version="2.0.10" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="1.1.2" />
     <PackageReference Include="System.Data.SqlClient" Version="4.4.2" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
-    <PackageReference Include="log4net" Version="2.0.8" />
+    <PackageReference Include="log4net" Version="2.0.10" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.0.2" />
     <PackageReference Include="System.Data.SqlClient" Version="4.4.2" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.1'">
-    <PackageReference Include="log4net" Version="2.0.8" />
+    <PackageReference Include="log4net" Version="2.0.10" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="3.*" />
     <PackageReference Include="Microsoft.Data.SqlClient" Version="1.*" />
   </ItemGroup>