Fix test flake and add `uv` dev dependency #16675

Job	Run time
docker, python:3.9	4m 28s
docker, python:3.10	5m 4s
docker, python:3.11	4m 36s
docker, python:3.12	4m 50s
Server Tests - python:3.9, postgres:14	3m 36s
Server Tests - python:3.10, postgres:14	3m 29s
Server Tests - python:3.11, postgres:14	3m 24s
Server Tests - python:3.12, postgres:14	3m 28s
Server Tests - python:3.9, sqlite	5m 8s
Server Tests - python:3.10, sqlite	4m 45s
Server Tests - python:3.11, sqlite	4m 47s
Server Tests - python:3.12, sqlite	5m 2s
Client Tests - python:3.9, postgres:14	6m 12s
Client Tests - python:3.10, postgres:14	5m 58s
Client Tests - python:3.11, postgres:14	5m 43s
Client Tests - python:3.12, postgres:14	5m 58s
	1h 16m 28s

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