Change log level from debug to info when spawning new gunicorn workers (#13780)

diff --git a/airflow/cli/commands/webserver_command.py b/airflow/cli/commands/webserver_command.py
index 6831553..bf60c1a 100644
--- a/airflow/cli/commands/webserver_command.py
+++ b/airflow/cli/commands/webserver_command.py
@@ -260,7 +260,8 @@
                 new_worker_count = min(
                     self.num_workers_expected - num_workers_running, self.worker_refresh_batch_size
                 )
-                self.log.debug(
+                # log at info since we are trying fix an error logged just above
+                self.log.info(
                     '[%d / %d] Spawning %d workers',
                     num_ready_workers_running,
                     num_workers_running,