add recently released pypy3.11 (#5534)

Author: mattip

.github/workflows/ci.yml

@@ -39,6 +39,7 @@ jobs:
         - 'pypy-3.8'
         - 'pypy-3.9'
         - 'pypy-3.10'
+        - 'pypy-3.11'
         - 'graalpy-24.1'
 
         # Items in here will either be added to the build matrix (if not