try to fix ci error

Author: Alvaro-Kothe

pandas/_libs/src/datetime/date_conversions.c

@@ -60,7 +60,7 @@ char *int64ToIso(int64_t value, NPY_DATETIMEUNIT valueUnit,
   if (ret_code != 0) {
     PyErr_SetString(PyExc_ValueError,
                     "Could not convert datetime value to string");
-    PyObject_Free(result);
+    PyMem_Free(result);
   }
 
   // Note that get_datetime_iso_8601_strlen just gives a generic size
@@ -88,7 +88,7 @@ char *int64ToIsoDuration(int64_t value, size_t *len) {
   if (ret_code == -1) {
     PyErr_SetString(PyExc_ValueError,
                     "Could not convert timedelta value to string");
-    PyObject_Free(result);
+    PyMem_Free(result);
     return NULL;
   }
 

pandas/_libs/src/datetime/pd_datetime.c

@@ -177,7 +177,7 @@ static char *PyDateTimeToIso(PyObject *obj, NPY_DATETIMEUNIT base,
   if (PyObject_HasAttrString(obj, "tzinfo")) {
     PyObject *offset = extract_utc_offset(obj);
     if (offset == NULL) {
-      PyObject_Free(result);
+      PyMem_Free(result);
       return NULL;
     }
     is_tz_aware = offset != Py_None;
@@ -188,7 +188,7 @@ static char *PyDateTimeToIso(PyObject *obj, NPY_DATETIMEUNIT base,
   if (ret != 0) {
     PyErr_SetString(PyExc_ValueError,
                     "Could not convert datetime value to string");
-    PyObject_Free(result);
+    PyMem_Free(result);
     return NULL;
   }