⬆️ upgrade log4net to 3.0.3

Author: xavierfoucrier

code/InboxNotifier.csproj

@@ -233,7 +233,7 @@
       <Version>1.11.71</Version>
     </PackageReference>
     <PackageReference Include="log4net">
-      <Version>2.0.17</Version>
+      <Version>3.0.3</Version>
     </PackageReference>
     <PackageReference Include="Newtonsoft.Json">
       <Version>13.0.3</Version>