[3.13] pythongh-120593: Fix const qualifier in pyatomic.h (pythonGH-1…

…21055) (python#121057)

pythongh-120593: Fix const qualifier in pyatomic.h (pythonGH-121055)
(cherry picked from commit 9cd2dcb)

Co-authored-by: Victor Stinner <vstinner@python.org>

Include/cpython/pyatomic_gcc.h

@@ -297,7 +297,7 @@ _Py_atomic_load_ssize(const Py_ssize_t *obj)
 
 static inline void *
 _Py_atomic_load_ptr(const void *obj)
-{ return (void *)__atomic_load_n((void **)obj, __ATOMIC_SEQ_CST); }
+{ return (void *)__atomic_load_n((void * const *)obj, __ATOMIC_SEQ_CST); }
 
 
 // --- _Py_atomic_load_relaxed -----------------------------------------------
@@ -356,7 +356,7 @@ _Py_atomic_load_ssize_relaxed(const Py_ssize_t *obj)
 
 static inline void *
 _Py_atomic_load_ptr_relaxed(const void *obj)
-{ return (void *)__atomic_load_n((const void **)obj, __ATOMIC_RELAXED); }
+{ return (void *)__atomic_load_n((void * const *)obj, __ATOMIC_RELAXED); }
 
 static inline unsigned long long
 _Py_atomic_load_ullong_relaxed(const unsigned long long *obj)
@@ -490,11 +490,11 @@ _Py_atomic_store_ullong_relaxed(unsigned long long *obj,
 
 static inline void *
 _Py_atomic_load_ptr_acquire(const void *obj)
-{ return (void *)__atomic_load_n((void **)obj, __ATOMIC_ACQUIRE); }
+{ return (void *)__atomic_load_n((void * const *)obj, __ATOMIC_ACQUIRE); }
 
 static inline uintptr_t
 _Py_atomic_load_uintptr_acquire(const uintptr_t *obj)
-{ return (uintptr_t)__atomic_load_n((uintptr_t *)obj, __ATOMIC_ACQUIRE); }
+{ return (uintptr_t)__atomic_load_n(obj, __ATOMIC_ACQUIRE); }
 
 static inline void
 _Py_atomic_store_ptr_release(void *obj, void *value)