Bump log4net in /sdk/mgmtcommon/ClientRuntime.Log4Net (#21964)

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)

---
updated-dependencies:
- dependency-name: log4net
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

sdk/mgmtcommon/ClientRuntime.Log4Net/Microsoft.Rest.ClientRuntime.Log4Net.csproj

@@ -16,7 +16,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="log4net" Version="2.0.3" />
+    <PackageReference Include="log4net" Version="2.0.10" />
     <!--<PackageReference Include="Microsoft.Rest.ClientRuntime" Version="2.3.6" />-->
   </ItemGroup>
 </Project>