Bump log4net from 2.0.17 to 3.0.3 in /Source

Bumps [log4net](https://github.com/apache/logging-log4net) from 2.0.17 to 3.0.3.
- [Release notes](https://github.com/apache/logging-log4net/releases)
- [Commits](apache/logging-log4net@rel/2.0.17...rel/3.0.3)

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

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

Source/ACE.DatLoader/ACE.DatLoader.csproj

@@ -15,7 +15,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="log4net" Version="2.0.17" />
+    <PackageReference Include="log4net" Version="3.0.3" />
     <PackageReference Include="System.Drawing.Common" Version="8.0.10" />
     <PackageReference Include="System.Text.Encoding.CodePages" Version="8.0.0" />
   </ItemGroup>

Source/ACE.Database/ACE.Database.csproj

@@ -17,7 +17,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="log4net" Version="2.0.17" />
+    <PackageReference Include="log4net" Version="3.0.3" />
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.10" />
     <PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="8.0.2" />
   </ItemGroup>

Source/ACE.Server/ACE.Server.csproj

@@ -235,7 +235,7 @@
 
   <ItemGroup>
     <PackageReference Include="Lib.Harmony" Version="2.3.3" />
-    <PackageReference Include="log4net" Version="2.0.17" />
+    <PackageReference Include="log4net" Version="3.0.3" />
     <PackageReference Include="Log4Net.Async.Standard" Version="3.1.0" />
     <PackageReference Include="McMaster.NETCore.Plugins" Version="1.4.0" />
     <PackageReference Include="MySqlConnector" Version="2.4.0" />