deps: Bump log4net from 2.0.16 to 3.1.0

---
updated-dependencies:
- dependency-name: log4net
  dependency-version: 3.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: xunit
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

telemetry/csharp/AwsToolkit.Telemetry.Events/AwsToolkit.Telemetry.Events.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 	<PropertyGroup>
 		<TargetFramework>net472</TargetFramework>
 		<RootNamespace>Amazon.AwsToolkit.Telemetry.Events</RootNamespace>
@@ -21,7 +21,7 @@
 		<AssemblyOriginatorKeyFile>..\toolkit-telemetry.snk</AssemblyOriginatorKeyFile>
 	</PropertyGroup>
 	<ItemGroup>
-	  <PackageReference Include="log4net" Version="2.0.16" />
+	  <PackageReference Include="log4net" Version="3.1.0" />
 	</ItemGroup>
 	<ItemGroup>
 		<Reference Include="System" />