v0.42.1 Rewrite and simplication of concurrent-ruby support

gossamer_forums.rb

@@ -1086,6 +1086,9 @@ class GossamerForumsImporter < ImportScripts::Base
     ###   mutex = Mutex.new      # Mutex for MySQL2 operations  --  disabled as this may not in fact be necessary - TBD.
     sqlite_mutex = Mutex.new  # Mutex for SQLite opreations
 
+    # Use CachedThreadPool for dynamic thread management
+    pool = Concurrent::CachedThreadPool.new
+
     # Run until all posts have been processed.
     until is_complete