Fix bug (missing commit) + SA2.0 usage in model.Job.update_hdca_update_time_for_job

[jdavcs]

This was missing a commit statement: with autocommit=False if skip_locked is supported sa_session.execute(implicit_statement) will be rolled back. (unless it's committed later, which we shouldn't rely upon).

In fact, i wonder whether we shouldn't just use a connection here instead of the session (we are in the else clause). but, in any case, the commit was missing.

(pulled out of #16724 for convenience)
Ref #12541

UPDATE: nope, this doesn't work. Maybe try a connection instead...

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