Merge branch '5.0/update-default-feeds' into 5.0-trunk

Author: sunnavy

etc/RTIR_Config.pm

@@ -925,9 +925,9 @@ Set(%ExternalFeeds,
             URI         => 'https://threatpost.com/category/vulnerabilities/feed/',
             Description => 'Threatpost Vulnerability Alerts',
         },
-        {   Name => 'Bugtraq',
-            URI => 'https://seclists.org/rss/bugtraq.rss',
-            Description => 'Bugtraq feed',
+        {   Name => 'US CISA Alerts',
+            URI => 'https://www.cisa.gov/uscert/ncas/current-activity.xml',
+            Description => 'U.S. Cybersecurity and Infrastructure Security Agency (CISA) Alerts',
         },
     ],
 );