update cpython cimports

not supposed to import anything from top-level cpython, supposed to use submodules

Author: minrk

zmq/backend/cython/_zmq.py

@@ -57,22 +57,20 @@
     size_t,
     sizeof,
 )
-from cython.cimports.cpython import (
-    PyBytes_AsString,
-    PyBytes_FromStringAndSize,
-    PyBytes_Size,
-    PyErr_CheckSignals,
-)
 from cython.cimports.cpython.buffer import (
     Py_buffer,
     PyBUF_ANY_CONTIGUOUS,
     PyBUF_WRITABLE,
     PyBuffer_Release,
     PyObject_GetBuffer,
 )
+from cython.cimports.cpython.bytes import (
+    PyBytes_AsString,
+    PyBytes_FromStringAndSize,
+    PyBytes_Size,
+)
+from cython.cimports.cpython.exc import PyErr_CheckSignals
 from cython.cimports.libc.errno import EAGAIN, EINTR, ENAMETOOLONG, ENOENT, ENOTSOCK
-
-# cimports require Cython 3
 from cython.cimports.libc.stdint import uint32_t
 from cython.cimports.libc.stdio import fprintf
 from cython.cimports.libc.stdio import stderr as cstderr