checks: correct the shebang line filtering for python files
As it is, the only related file is docs/test2rst.py, which was covered by **.py.
Not sure if it matters, but most patterns in core tests are for "#!.*?python".
(Though there are a couple "#!.*python" tests.)
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Copyright 2011 Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
Logilab SA <contact@logilab.fr>
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
Patrick Mezard <patrick@mezard.eu>
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