fix incorrect use of `getattr` #18930

Job	Run time
typesafety	1m 59s
docker, python:3.9	4m 44s
docker, python:3.10	4m 57s
Server Tests - python:3.9, postgres:14	6m 3s
docker, python:3.11	4m 57s
Server Tests - python:3.10, postgres:14	6m 9s
docker, python:3.12	4m 34s
Server Tests - python:3.11, postgres:14	6m 7s
Server Tests - python:3.12, postgres:14	6m 6s
Server Tests - python:3.9, sqlite	6m 4s
Server Tests - python:3.10, sqlite	6m 5s
Server Tests - python:3.11, sqlite	6m 2s
Server Tests - python:3.12, sqlite	6m 3s
Client Tests - python:3.9, postgres:14	7m 15s
Client Tests - python:3.10, postgres:14	7m 16s
Client Tests - python:3.11, postgres:14	7m 16s
Client Tests - python:3.12, postgres:14	7m 17s
Runner and Worker Tests - python:3.9, postgres:14	2m 18s
Runner and Worker Tests - python:3.10, postgres:14	2m 0s
Runner and Worker Tests - python:3.11, postgres:14	2m 1s
Runner and Worker Tests - python:3.12, postgres:14	2m 19s
combine-coverage	1s
	1h 47m 33s

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