https://bugs.gentoo.org/981284

Raise limited api version to the minimum supported by cython 3.3

--- a/setup.py
+++ b/setup.py
@@ -10,7 +10,7 @@ from Cython.Build import cythonize
 #
 # Py_LIMITED_API values:
 #
-# 0x03080000 - Python 3.8 - the minimum version that Cython supports.
+# 0x03090000 - Python 3.9 - the minimum version that Cython-3.3 supports.
 # 0x030B0000 - Python 3.11 - support typed memoryviews.
 # 0x030C0000 - Python 3.12 - support vectorcall (performance improvement).
 
@@ -21,12 +21,11 @@ if sys.implementation.name == "cpython" and not sysconfig.get_config_var(
 ):
     py_limited_api_kwargs = {
         "define_macros": [
-            # For now we are at python 3.8 as we still support 3.10.
-            ("Py_LIMITED_API", 0x03080000),
+            ("Py_LIMITED_API", 0x03090000),
         ],
         "py_limited_api": True,
     }
-    bdist_wheel_kwargs = {"py_limited_api": "cp38"}
+    bdist_wheel_kwargs = {"py_limited_api": "cp39"}
 
 setup(
     ext_modules=cythonize(