pythonGH-104308: socket.getnameinfo should release the GIL (pythonGH-104307)

* socket.getnameinfo should release the GIL

* 📜🤖 Added by blurb_it.

---------

(cherry picked from commit faf1962)

Co-authored-by: Nathaniel J. Smith <njs@pobox.com>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>

Author: 2 people

Misc/NEWS.d/next/Library/2023-05-08-20-57-17.gh-issue-104307.DSB93G.rst

@@ -0,0 +1 @@
+:func:`socket.getnameinfo` now releases the GIL while contacting the DNS server

Modules/socketmodule.c

@@ -6737,8 +6737,10 @@ socket_getnameinfo(PyObject *self, PyObject *args)
         }
 #endif
     }
+    Py_BEGIN_ALLOW_THREADS
     error = getnameinfo(res->ai_addr, (socklen_t) res->ai_addrlen,
                     hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), flags);
+    Py_END_ALLOW_THREADS
     if (error) {
         set_gaierror(error);
         goto fail;