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This prevents loading loggers needlessly.

Let's match cw-celerytask-helpers version.

This time no upper range.

This allows installation of cw-celerytask-helpers 0.8.0 which is still
compatible.

Why upgrading CubicWeb minimum version? We don't support 3.25 and
less, and even 3.26 should disappear but it is the last version
that supports Python 2 and it is in consequence sadly still used.
So it is better not to create illusion and be clear that we won't
add a fix for a too old version of CubicWeb. Projects must
upgrade, maintaining very old stuff is dirty work.

In a client project, we add the case of `result.info` being
`UException` (from `cubicweb_nemo.utils`). It resulted in a
problem, because `result.info` is `True` as boolean, but it has
no key, so it crashed. This patch does not resolve the real
problem of having a clean `info` member or knowing why it could
normally have a different type, but at least it eliminates a
problem for the final users.