Merge pull request #2082 from excelite/add_centralized_logging_support

added required nuget package to enable serilog based centralized logging in gelf format

Jellyfin.Server/Jellyfin.Server.csproj

@@ -46,6 +46,7 @@
     <PackageReference Include="Serilog.Sinks.Async" Version="1.4.0" />
     <PackageReference Include="Serilog.Sinks.Console" Version="3.1.1" />
     <PackageReference Include="Serilog.Sinks.File" Version="4.1.0" />
+    <PackageReference Include="Serilog.Sinks.Graylog" Version="2.1.1" />
     <PackageReference Include="SQLitePCLRaw.bundle_e_sqlite3" Version="2.0.2" />
     <PackageReference Include="SQLitePCLRaw.provider.sqlite3.netstandard11" Version="1.1.14" />
   </ItemGroup>