Update URLs in comments and metadata to use HTTPS (GH-27458) (GH-27478)

(cherry picked from commit be42c06bb01206209430f3ac08b72643dc7cad1c)

Co-authored-by: Noah Kantrowitz <noah@coderanger.net>
diff --git a/Modules/_elementtree.c b/Modules/_elementtree.c
index 85fdfa7..b4528a9 100644
--- a/Modules/_elementtree.c
+++ b/Modules/_elementtree.c
@@ -1,6 +1,6 @@
 /*--------------------------------------------------------------------
  * Licensed to PSF under a Contributor Agreement.
- * See http://www.python.org/psf/license for licensing details.
+ * See https://www.python.org/psf/license for licensing details.
  *
  * _elementtree - C accelerator for xml.etree.ElementTree
  * Copyright (c) 1999-2009 by Secret Labs AB.  All rights reserved.