python: replace <=3.12 with <3.13 for google-apitools marker (semantics unchanged) (#35929)

Co-authored-by: Diego Hernandez <diego@m4-pro.local>

Author: diegofhdz

sdks/python/setup.py

@@ -453,7 +453,7 @@ def get_portability_package_data():
           'gcp': [
               'cachetools>=3.1.0,<7',
               'google-api-core>=2.0.0,<3',
-              'google-apitools>=0.5.31,<0.5.32; python_version <= "3.12"',
+              'google-apitools>=0.5.31,<0.5.32; python_version < "3.13"',
               'google-apitools>=0.5.32,<0.5.33; python_version >= "3.13"',
               # NOTE: Maintainers, please do not require google-auth>=2.x.x
               # Until this issue is closed