Bump log4net from 2.0.15 to 3.3.0

---
updated-dependencies:
- dependency-name: log4net
  dependency-version: 3.3.0
  dependency-type: direct:production
...

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Author: dependabot[bot]

Zxw.Framework.NetCore/Zxw.Framework.NetCore.csproj

@@ -62,7 +62,7 @@
     <PackageReference Include="DotNetCore.NPOI" Version="1.2.3" />
     <PackageReference Include="Exceptionless" Version="4.8.0" />
     <PackageReference Include="Jil" Version="2.17.0" />
-    <PackageReference Include="log4net" Version="2.0.15" />
+    <PackageReference Include="log4net" Version="3.3.0" />
     <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="5.2.9" />
     <PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.2.0" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="2.2.5" />