gh-110397: Add Py_IsFinalizing() to the stable ABI (#110441)

Author: vstinner

Doc/data/stable_abi.dat

@@ -81,5 +81,3 @@ PyAPI_FUNC(PyStatus) Py_NewInterpreterFromConfig(
 typedef void (*atexit_datacallbackfunc)(void *);
 PyAPI_FUNC(int) PyUnstable_AtExit(
         PyInterpreterState *, atexit_datacallbackfunc, void *);
-
-PyAPI_FUNC(int) Py_IsFinalizing(void);

Include/cpython/pylifecycle.h

@@ -60,6 +60,10 @@ PyAPI_FUNC(PyOS_sighandler_t) PyOS_setsig(int, PyOS_sighandler_t);
 PyAPI_DATA(const unsigned long) Py_Version;
 #endif
 
+#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030D0000
+PyAPI_FUNC(int) Py_IsFinalizing(void);
+#endif
+
 #ifndef Py_LIMITED_API
 #  define Py_CPYTHON_PYLIFECYCLE_H
 #  include "cpython/pylifecycle.h"

Include/pylifecycle.h

@@ -2460,3 +2460,5 @@
     added = '3.13'
 [function.PyMapping_HasKeyStringWithError]
     added = '3.13'
+[function.Py_IsFinalizing]
+    added = '3.13'