Fix #16176. Properly identify Windows 8 via platform.platform()

Add handling of the 6.2 release line, aka Windows 8 and Windows 2012 Server.
diff --git a/Misc/NEWS b/Misc/NEWS
index fb84312..7d45a89 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -119,6 +119,8 @@
 Library
 -------
 
+- Issue #16176: Properly identify Windows 8 via platform.platform()
+
 - Issue #15756: subprocess.poll() now properly handles errno.ECHILD to
   return a returncode of 0 when the child has already exited or cannot
   be waited on.