bpo-36502: Update link to UAX GH-44, the Unicode doc on the UCD. (GH-15301)


The link we have points to the version from Unicode 6.0.0, dated 2010.
There have been numerous updates to it since then:
  https://www.unicode.org/reports/tr44/GH-Modifications

Change the link to one that points to the current version. Also, use HTTPS.
(cherry picked from commit 64c6ac74e254d31f93fcc74bf02b3daa7d3e3f25)

Co-authored-by: Greg Price <gnprice@gmail.com>
diff --git a/Doc/library/unicodedata.rst b/Doc/library/unicodedata.rst
index ee790c0..225384c 100644
--- a/Doc/library/unicodedata.rst
+++ b/Doc/library/unicodedata.rst
@@ -22,7 +22,7 @@
 
 The module uses the same names and symbols as defined by Unicode
 Standard Annex #44, `"Unicode Character Database"
-<http://www.unicode.org/reports/tr44/tr44-6.html>`_.  It defines the
+<https://www.unicode.org/reports/tr44/>`_.  It defines the
 following functions: