python-dogpile.cache: add python-decorator as dep

[Bridouz]

Noticed that python-dogpile.cache did not have python-decorator as dep.

Thus, Usage of subliminal exits with error about not finding python-decorator which is needed by python-dogpile.cache.

Fixed and working.

[Hoshpak]

inconsitency in dependencies: a python 2 package should not depend on a python 3 library

[Hoshpak]

please bump the revision of the template, otherwise it won't trigger a rebuild and the changes won't affect the binary package in the repository.

[Hoshpak]

please squash the commits into one