Bump log4net from 2.0.10 to 2.0.12 (#2204)

Bumps [log4net](https://github.com/apache/logging-log4net) from 2.0.10 to 2.0.12.
- [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/2.0.10...rc/2.0.12)

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

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

LOGGING/src/Log4NetAppender/Log4NetAppender.csproj

@@ -20,7 +20,7 @@
       <PrivateAssets>All</PrivateAssets>
     </PackageReference>
     <ProjectReference Include="..\..\..\BASE\src\Microsoft.ApplicationInsights\Microsoft.ApplicationInsights.csproj" />
-    <PackageReference Include="log4net" Version="2.0.10" />
+    <PackageReference Include="log4net" Version="2.0.12" />
   </ItemGroup>
   
   <ItemGroup>

LOGGING/test/Log4NetAppender.Tests/Log4NetAppender.Tests.csproj

@@ -11,7 +11,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
     <PackageReference Include="MSTest.TestAdapter" Version="2.1.2" />
     <PackageReference Include="MSTest.TestFramework" Version="2.1.2" />
-    <PackageReference Include="log4net" Version="2.0.10" />
+    <PackageReference Include="log4net" Version="2.0.12" />
     <ProjectReference Include="..\..\..\BASE\src\Microsoft.ApplicationInsights\Microsoft.ApplicationInsights.csproj" />
     <ProjectReference Include="..\..\src\Log4NetAppender\Log4NetAppender.csproj" />
   </ItemGroup>

LOGGING/test/TraceListener.Tests/TraceListener.Tests.csproj

@@ -11,7 +11,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
     <PackageReference Include="MSTest.TestAdapter" Version="2.1.2" />
     <PackageReference Include="MSTest.TestFramework" Version="2.1.2" />
-    <PackageReference Include="log4net" Version="2.0.8" />
+    <PackageReference Include="log4net" Version="2.0.12" />
     <ProjectReference Include="..\..\..\BASE\src\Microsoft.ApplicationInsights\Microsoft.ApplicationInsights.csproj" />
     <ProjectReference Include="..\..\src\TraceListener\TraceListener.csproj" />
   </ItemGroup>