Attempt to make a few flaky tests more robust. #3115

Job	Run time
Check GitHub Organization	1s
tox -e format-check,lint-check,typecheck,vendor-check,package,docs	8m 40s
tox -e py312-pip24_2	19m 29s
./dtox.sh -e py27-pip20	9m 7s
tox -e py312-pip24_2-integration --shard 1/2	34m 36s
./dtox.sh -e py37-pip22_3_1	16m 57s
tox -e py312-pip24_2-integration --shard 2/2	28m 47s
./dtox.sh -e py311-pip23_3_2	17m 31s
./dtox.sh -e py312-pip24_2	15m 21s
./dtox.sh -e py313-pip24_2	13m 10s
./dtox.sh -e pypy310-pip24_2	26m 44s
./dtox.sh -e py27-pip20-integration	27m 1s
./dtox.sh -e py37-pip22_3_1-integration --shard 1/2	25m 57s
./dtox.sh -e py37-pip22_3_1-integration --shard 2/2	28m 43s
./dtox.sh -e py311-pip23_3_2-integration --shard 1/2	28m 25s
./dtox.sh -e py311-pip23_3_2-integration --shard 2/2	27m 11s
./dtox.sh -e py312-pip24_2-integration --shard 1/2	28m 41s
./dtox.sh -e py312-pip24_2-integration --shard 2/2	27m 40s
./dtox.sh -e py313-pip24_2-integration --shard 1/2	24m 9s
./dtox.sh -e py313-pip24_2-integration --shard 2/2	25m 12s
./dtox.sh -e pypy310-pip24_2-integration --shard 1/2	44m 20s
./dtox.sh -e pypy310-pip24_2-integration --shard 2/2	46m 2s
Gather Final Status	1s
	8h 43m 45s

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