Bump Serilog.Sinks.Graylog from 2.1.2 to 2.1.3

Bumps [Serilog.Sinks.Graylog](https://github.com/whir1/serilog-sinks-graylog) from 2.1.2 to 2.1.3.
- [Release notes](https://github.com/whir1/serilog-sinks-graylog/releases)
- [Commits](https://github.com/whir1/serilog-sinks-graylog/commits)

Signed-off-by: dependabot[bot] <support@github.com>

Jellyfin.Server/Jellyfin.Server.csproj

@@ -51,7 +51,7 @@
     <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="2.1.2" />
+    <PackageReference Include="Serilog.Sinks.Graylog" Version="2.1.3" />
     <PackageReference Include="SQLitePCLRaw.bundle_e_sqlite3" Version="2.0.3" />
     <PackageReference Include="SQLitePCLRaw.provider.sqlite3.netstandard11" Version="1.1.14" />
   </ItemGroup>