gh-103857: Update deprecation stacktrace to point to calling line (#104431)

Author: hugovk

Diff for: Misc/NEWS.d/next/Library/2023-05-12-19-29-28.gh-issue-103857.0IzSxr.rst

@@ -0,0 +1 @@
+Update datetime deprecations' stracktrace to point to the calling line

Diff for: Modules/_datetimemodule.c

@@ -5147,7 +5147,7 @@ datetime_utcnow(PyObject *cls, PyObject *dummy)
     if (PyErr_WarnEx(PyExc_DeprecationWarning,
         "datetime.utcnow() is deprecated and scheduled for removal in a "
         "future version. Use timezone-aware objects to represent datetimes "
-        "in UTC: datetime.now(datetime.UTC).", 2))
+        "in UTC: datetime.now(datetime.UTC).", 1))
     {
         return NULL;
     }
@@ -5190,7 +5190,7 @@ datetime_utcfromtimestamp(PyObject *cls, PyObject *args)
     if (PyErr_WarnEx(PyExc_DeprecationWarning,
         "datetime.utcfromtimestamp() is deprecated and scheduled for removal "
         "in a future version. Use timezone-aware objects to represent "
-        "datetimes in UTC: datetime.now(datetime.UTC).", 2))
+        "datetimes in UTC: datetime.now(datetime.UTC).", 1))
     {
         return NULL;
     }