Update python-django to 1.2.3 version to fix an XSS vulnerability

[Krzysztof Klimonda]

A new vulnerability has been discovered in 1.2 branch and two new django
releases were made: 1.2.2 which fixes an xss vulnerability [1] and the
1.2.3 that fixes two regressions caused by previous release [2]. All
users are advised to update so I'm preparing an update and asking for
FFe.

[1] http://www.djangoproject.com/weblog/2010/sep/08/security-release/
[2] http://www.djangoproject.com/weblog/2010/sep/10/123/

 affects ubuntu/python-django
 importance high
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