Bump PlaylistsNET from 1.1.3 to 1.2.1 (#7728)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

MediaBrowser.Providers/MediaBrowser.Providers.csproj

@@ -21,7 +21,7 @@
     <PackageReference Include="Microsoft.Extensions.Http" Version="6.0.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="OptimizedPriorityQueue" Version="5.0.0" />
-    <PackageReference Include="PlaylistsNET" Version="1.1.3" />
+    <PackageReference Include="PlaylistsNET" Version="1.2.1" />
     <PackageReference Include="TMDbLib" Version="1.9.1" />
   </ItemGroup>