As reported by sentry [1], webapps (staging [2], prod [3] [4]) fails with a python
exception.
It seems the current deployed version of the storage (v0.31) is out of sync with what
the webapp expects (at least v0.32).
Fix it.
[1] https://sentry.softwareheritage.org/share/issue/18076271280b4eb6843241f5296c37bb/