component/dropbear: update download URL

component/dropbear/buildout.cfg

@@ -18,7 +18,7 @@ recipe = slapos.recipe.cmmi
 md5sum = 0284ea239083f04c8b874e08e1aca243
 # XXX: We still use an old version of dropbear instead of the last one
 #      in order have all patches working.
-url = http://matt.ucc.asn.au/dropbear/releases/dropbear-0.53.1.tar.bz2
+url = https://matt.ucc.asn.au/dropbear/releases/dropbear-0.53.1.tar.bz2
 
 configure-options =
   --with-zlib=${zlib:location}