[RefreshChannelsJob] Reduce backoff if no errors occur (#5759)

* [RefreshChannelsJob] Reduce backoff if no errors occur

* Change log level for backoff decrease

src/invidious/jobs/refresh_channels_job.cr

@@ -36,6 +36,11 @@ class Invidious::Jobs::RefreshChannelsJob < Invidious::Jobs::BaseJob
 
               LOGGER.trace("RefreshChannelsJob: #{id} fiber : Updating DB")
               Invidious::Database::Channels.update_author(id, channel.author)
+
+              if backoff > 2.minutes
+                backoff /= 2
+                LOGGER.debug("RefreshChannelsJob: #{id} fiber : decreasing backoff to #{backoff}s")
+              end
             rescue ex
               LOGGER.error("RefreshChannelsJob: #{id} : #{ex.message}")
               if ex.message == "Deleted or invalid channel"