[FIX] base: always preload dateutil

The dateutil package uses lazy import to selectively expose its
features: `parser`, `relativedelta`, `rrule`, `tz`.

Depending on installed modules and order of initialization, there was no
guarantee that a given feature was already loaded during the preparation
of the action context.

This patch ensures that we always preload the feature set we need, and
only that feature set. This way we have a consistent `dateutil` lib in
the action context at all times.

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