Tick off 5.40.0 and add 5.38.3/5.40.1 in the release schedule

Author: steve-m-hay

Porting/release_schedule.pod

@@ -17,14 +17,14 @@ deemed necessary by the Steering Council.
 
 =head2 Perl 5.40
 
-  2024-06-09  5.40.0          Graham Knop
-  2024-??-??  5.40.1
+  2024-06-09  5.40.0  ✓       Graham Knop
+  2025-01-18  5.40.1          Steve Hay
 
 =head2 Perl 5.38
 
   2023-07-01  5.38.0  ✓       Ricardo Signes
   2023-11-29  5.38.2  ✓       Paul Evans
-  2024-??-??  5.38.3
+  2025-01-18  5.38.3          Steve Hay
 
 =head1 DEVELOPMENT RELEASE SCHEDULE