bpo-40522: Replace PyThreadState_GET() with PyThreadState_Get() (GH-24575)

Use directly the PyThreadState_Get() function in public header files,
since PyThreadState_GET() macro is just an alias to it in pratice in
these files.

Include/cpython/abstract.h

@@ -119,7 +119,7 @@ static inline PyObject *
 PyObject_Vectorcall(PyObject *callable, PyObject *const *args,
                      size_t nargsf, PyObject *kwnames)
 {
-    PyThreadState *tstate = PyThreadState_GET();
+    PyThreadState *tstate = PyThreadState_Get();
     return _PyObject_VectorcallTstate(tstate, callable,
                                       args, nargsf, kwnames);
 }
@@ -155,7 +155,7 @@ _PyObject_FastCallTstate(PyThreadState *tstate, PyObject *func, PyObject *const
 static inline PyObject *
 _PyObject_FastCall(PyObject *func, PyObject *const *args, Py_ssize_t nargs)
 {
-    PyThreadState *tstate = PyThreadState_GET();
+    PyThreadState *tstate = PyThreadState_Get();
     return _PyObject_FastCallTstate(tstate, func, args, nargs);
 }
 
@@ -164,7 +164,7 @@ _PyObject_FastCall(PyObject *func, PyObject *const *args, Py_ssize_t nargs)
    PyObject_CallNoArgs(). */
 static inline PyObject *
 _PyObject_CallNoArg(PyObject *func) {
-    PyThreadState *tstate = PyThreadState_GET();
+    PyThreadState *tstate = PyThreadState_Get();
     return _PyObject_VectorcallTstate(tstate, func, NULL, 0, NULL);
 }
 
@@ -179,7 +179,7 @@ PyObject_CallOneArg(PyObject *func, PyObject *arg)
     assert(arg != NULL);
     args = _args + 1;  // For PY_VECTORCALL_ARGUMENTS_OFFSET
     args[0] = arg;
-    tstate = PyThreadState_GET();
+    tstate = PyThreadState_Get();
     nargsf = 1 | PY_VECTORCALL_ARGUMENTS_OFFSET;
     return _PyObject_VectorcallTstate(tstate, func, args, nargsf, NULL);
 }

Include/cpython/object.h

@@ -528,7 +528,7 @@ PyAPI_FUNC(int) _PyTrash_cond(PyObject *op, destructor dealloc);
         /* If "cond" is false, then _tstate remains NULL and the deallocator \
          * is run normally without involving the trashcan */ \
         if (cond) { \
-            _tstate = PyThreadState_GET(); \
+            _tstate = PyThreadState_Get(); \
             if (_PyTrash_begin(_tstate, _PyObject_CAST(op))) { \
                 break; \
             } \