Update uptime logic to handle updown.io response

src/invidious/jobs/instance_refresh_job.cr

@@ -89,8 +89,8 @@ class Invidious::Jobs::InstanceListRefreshJob < Invidious::Jobs::BaseJob
 
   # Checks if the uptime of the target instance is greater than 90% over a 30 day period
   private def bad_uptime?(target_instance_health_monitor) : Bool
-    return true if !target_instance_health_monitor["statusClass"] == "success"
-    return true if target_instance_health_monitor["30dRatio"]["ratio"].as_s.to_f < 90
+    return true if !target_instance_health_monitor["down"].as_bool == false
+    return true if target_instance_health_monitor["uptime"].as_f < 90
 
     return false
   end