Add new UW retrospective covid vaccine value to mapper.

Author: davereinhart

lib/seattleflu/id3c/cli/command/etl/redcap_det_uw_retrospectives.py

@@ -456,6 +456,7 @@ def create_immunization(record: dict, patient_reference: dict) -> Optional[list]
         "covid-19 pfizer mrna seasonal 12 yrs and older (comirnaty)":       309,
         "covid-19 moderna mrna 2023-24 6 mos-11 yrs old":                   311,
         "covid-19 moderna mrna 6 mos-11 yrs old":                           311,
+        "covid-19 moderna mrna seasonal 6 mos-11 yrs old":                  311,
         "covid-19 moderna mrna 2023-24 12 yrs and older (spikevax)":        312,
         "covid-19 moderna mrna 12 yrs and older (spikevax)":                312,
         "covid-19 moderna mrna seasonal 12 yrs and older (spikevax)":       312,