Bump log4net from 2.0.15 to 3.0.4 (#219)

Bumps [log4net](https://github.com/apache/logging-log4net) from 2.0.15 to 3.0.4.
- [Release notes](https://github.com/apache/logging-log4net/releases)
- [Commits](apache/logging-log4net@rel/2.0.15...rel/3.0.4)

---
updated-dependencies:
- dependency-name: log4net
  dependency-version: 3.0.4
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: PhyxionNL <7643972+PhyxionNL@users.noreply.github.com>

Author: dependabot[bot]

PacketDotNet/PacketDotNet.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFrameworks>net8.0;net9.0;net472</TargetFrameworks>
@@ -33,7 +33,7 @@
   </PropertyGroup>  
 
   <ItemGroup Condition="'$(Configuration)'=='Debug'">
-    <PackageReference Include="log4net" Version="2.0.15" />
+    <PackageReference Include="log4net" Version="3.0.4" />
   </ItemGroup>  
 
   <ItemGroup>

Test/Test.csproj

@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="log4net" Version="2.0.15" />
+    <PackageReference Include="log4net" Version="3.0.4" />
     <PackageReference Include="nunit" Version="4.3.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />