Stop testing 3.13 on bigmem after final release (#540)

Author: ambv

master/custom/workers.py

@@ -230,7 +230,7 @@ def get_workers(settings):
         cpw(
             name="ambv-bb-win11",
             tags=['windows', 'win11', 'amd64', 'x86-64', 'bigmem'],
-            not_branches=['3.9', '3.10', '3.11', '3.12'],
+            not_branches=['3.9', '3.10', '3.11', '3.12', '3.13'],
             parallel_tests=4,
         ),
         cpw(