The module `mass_mailing_event_sms` extends couple methods [1] that are defined
in  module `mass_mailing_event` [2]. However, because of the missing dependency
in manifest, user can uninstall `mass_mailing_event`, while keep
`mass_mailing_event_sms` installed. This leads to error `'super' object has no
attribute 'action_invite_contacts'` [3].

Fix it by adding the missing dependency explicitly.

[1]: https://github.com/odoo/odoo/blob/fd508fe436c64780a8454ddeb6b7ec8f1f80d7c5/addons/mass_mailing_event_sms/models/event.py

[2]:
https://github.com/odoo/odoo/blob/fd508fe436c64780a8454ddeb6b7ec8f1f80d7c5/addons/mass_mailing_event/models/event.py#L23

[3]: https://online.sentry.io/issues/4280254156/



closes odoo/odoo#127221

Signed-off-by: Ivan Elizaryev (iel) <iel@odoo.com>