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 9e1e96b..e1356ad 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -129,6 +129,8 @@
 Library
 -------
 
+- Issue #16176: Properly identify Windows 8 via platform.platform()
+
 - Issue #16114: The subprocess module no longer provides a misleading
   error message stating that args[0] did not exist when either the cwd or
   executable keyword arguments specified a path that did not exist.