Remove info log about closing parent pipe (#27054)

This log line is better removed, it doesn't seem like it's worth having since now it pollutes
the logs whenever there's an import error

(cherry picked from commit 3310618)

airflow/dag_processing/processor.py

@@ -136,8 +136,6 @@ def _run_file_processor(
 
         # Since we share all open FDs from the parent, we need to close the parent side of the pipe here in
         # the child, else it won't get closed properly until we exit.
-        log.info("Closing parent pipe")
-
         parent_channel.close()
         del parent_channel