[www] Set Victoria status to Extended Maintenance

Project's last releases in Victoria have been tagged with victoria-em.
Now indicate that Victoria is in Extended Maintenance phase also at
https://docs.openstack.org

Planned transition date is April 27th, 2022.

Change-Id: Ie8679bc66d52f35789700d680b9679649fc7368c

tools/www-generator.py

@@ -65,7 +65,7 @@ SERIES_INFO = {
     'stein': SeriesInfo(date='April 2019', status='extended-maintenance'),
     'train': SeriesInfo(date='October 2019', status='extended-maintenance'),
     'ussuri': SeriesInfo(date='May 2020', status='extended-maintenance'),
-    'victoria': SeriesInfo(date='October 2020', status='maintained'),
+    'victoria': SeriesInfo(date='October 2020', status='extended-maintenance'),
     'wallaby': SeriesInfo(date='April 2021', status='maintained'),
     'xena': SeriesInfo(date='October 2021', status='maintained'),
     'yoga': SeriesInfo(date='April 2022', status='maintained'),