build: update osm-fieldwork --> 0.16.12 for latest xlsform #1430

Job	Run time
backend-test / check-img-cache	3s
frontend-unit-test / Run Frontend Tests	25s
backend-test / test-img-build / build-image	1m 43s
frontend-build / build-image	1m 44s
backend-test / test-img-build / scan-image	0s
backend-test / run-tests	3m 44s
frontend-build / scan-image	28s
smoke-test-frontend	55s
backend-build / build-image	1m 30s
backend-build / scan-image	17s
smoke-test-backend	1m 10s
deploy-containers / remote-deploy	1m 10s
	13m 9s

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