Why are there no dollar bills printed after 2009?

There are. Billions of bills have been printed since 2009 but they all carry that same date.

Remember, the date on US bills is a "series" date, not the date it was printed. A new series usually (but not always) is started when a new Secretary of the Treasury takes office, or in many cases, when there's a design change. The same date is used until the next change.

Timothy Geitner was appointed as Treasury Secretary in 2009 and remained in office until 2013 so bills printed during his term almost* all carry that date. Jack Lew took office in 2013 so the next series will carry that date.

(*) "Almost" all bills carry the same date because there's often an overlap, with new bills being printed at the same time production of the old series winds down.