bpo-39242: Updated the Gmane domain into news.gmane.io (GH-17903)

(cherry picked from commit 2e6a8efa837410327b593dc83c57492253b1201e)

Co-authored-by: Dong-hee Na <donghee.na92@gmail.com>
diff --git a/Lib/test/test_nntplib.py b/Lib/test/test_nntplib.py
index 618b403..fbd7db0 100644
--- a/Lib/test/test_nntplib.py
+++ b/Lib/test/test_nntplib.py
@@ -633,7 +633,7 @@
                     "\tSat, 19 Jun 2010 18:04:08 -0400"
                     "\t<4FD05F05-F98B-44DC-8111-C6009C925F0C@gmail.com>"
                     "\t<hvalf7$ort$1@dough.gmane.org>\t7103\t16"
-                    "\tXref: news.gmane.org gmane.comp.python.authors:57"
+                    "\tXref: news.gmane.io gmane.comp.python.authors:57"
                     "\n"
                 "58\tLooking for a few good bloggers"
                     "\tDoug Hellmann <doug.hellmann-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>"
@@ -1119,7 +1119,7 @@
             "references": "<hvalf7$ort$1@dough.gmane.org>",
             ":bytes": "7103",
             ":lines": "16",
-            "xref": "news.gmane.org gmane.comp.python.authors:57"
+            "xref": "news.gmane.io gmane.comp.python.authors:57"
             })
         art_num, over = overviews[1]
         self.assertEqual(over["xref"], None)