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](https://github.com/apache/logging-log4net/compare/rel/2.0.8...rel/2.0.10)

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

src/Unity.log4net.csproj

@@ -47,7 +47,7 @@
 
 
   <ItemGroup>
-    <PackageReference Include="log4net" Version="2.0.8" />
+    <PackageReference Include="log4net" Version="2.0.10" />
   </ItemGroup>
 
   <!-- Sourcelink -->