New: (Rarbg) Obsolete due to tracker shutdown

src/NzbDrone.Core.Test/IndexerTests/RarbgTests/RarbgFixture.cs

@@ -17,6 +17,7 @@ using NzbDrone.Test.Common;
 
 namespace NzbDrone.Core.Test.IndexerTests.RarbgTests
 {
+    [Obsolete("Rarbg has shutdown 2023-05-31")]
     [TestFixture]
     public class RarbgFixture : CoreTest<Rarbg>
     {

src/NzbDrone.Core/Indexers/Definitions/Rarbg/Rarbg.cs

@@ -20,6 +20,7 @@ using NzbDrone.Core.Validation;
 
 namespace NzbDrone.Core.Indexers.Definitions.Rarbg
 {
+    [Obsolete("Rarbg has shutdown 2023-05-31")]
     public class Rarbg : TorrentIndexerBase<RarbgSettings>
     {
         public override string Name => "Rarbg";