fix incorrect use of `getattr` #18931

Job	Run time
typesafety	1m 59s
docker, python:3.9	4m 44s
Server Tests - python:3.9, postgres:14	9m 34s
docker, python:3.10	4m 48s
docker, python:3.11	5m 12s
Server Tests - python:3.10, postgres:14	9m 28s
Server Tests - python:3.11, postgres:14	8m 29s
docker, python:3.12	4m 32s
Server Tests - python:3.12, postgres:14	8m 27s
Server Tests - python:3.9, sqlite	11m 18s
Server Tests - python:3.10, sqlite	11m 23s
Server Tests - python:3.11, sqlite	10m 36s
Server Tests - python:3.12, sqlite	9m 38s
Client Tests - python:3.9, postgres:14	11m 31s
Client Tests - python:3.10, postgres:14	10m 54s
Client Tests - python:3.11, postgres:14	10m 29s
Client Tests - python:3.12, postgres:14	9m 19s
Runner and Worker Tests - python:3.9, postgres:14	2m 16s
Runner and Worker Tests - python:3.10, postgres:14	2m 1s
Runner and Worker Tests - python:3.11, postgres:14	2m 1s
Runner and Worker Tests - python:3.12, postgres:14	2m 11s
combine-coverage	35s
	2h 31m 25s

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