[vk] Fix extraction (Closes #6153)

youtube_dl/extractor/vk.py

@@ -153,7 +153,7 @@ class VKIE(InfoExtractor):
         if not video_id:
             video_id = '%s_%s' % (mobj.group('oid'), mobj.group('id'))
 
-        info_url = 'http://vk.com/al_video.php?act=show&al=1&module=video&video=%s' % video_id
+        info_url = 'https://vk.com/al_video.php?act=show&al=1&module=video&video=%s' % video_id
         info_page = self._download_webpage(info_url, video_id)
 
         ERRORS = {