bring in a new release manager for October

Max agreed to swap his release from October to January.

Thibault, Eric and Philippe are working on improving the release
process, and we figured doing three releases in a row would help
dog-fooding and build upon our progress over time.

Author: book

Porting/release_schedule.pod

@@ -46,10 +46,10 @@ you should reset the version numbers to the next blead series.
   2025-07-20  5.43.1  ✓       Richard Leach
   2025-08-20  5.43.2  ✓       Karen Etheridge
   2025-09-20  5.43.3          Philippe Bruhat
-  2025-10-20  5.43.4          Max Maischein
+  2025-10-20  5.43.4          Eric Herman
   2025-11-20  5.43.5          Thibault Duponchelle
   2025-12-20  5.43.6          Steve Hay
-  2026-01-20  5.43.7          Thibault Duponchelle
+  2026-01-20  5.43.7          Max Maischein
   2026-02-20  5.43.8                            Contentious changes freeze
   2026-03-20  5.43.9                            User-visible changes to
                                                 correctly functioning