Fix test for Python >=3.13. #3333

Job	Run time
Check GitHub Organization	1s
tox -e format-check,lint-check,typecheck,enum-check,vendor-check,package,docs	1m 25s
tox -e py313-pip24_3_1	1m 27s
./dtox.sh -e py27-pip20	1m 24s
tox -e py313-pip24_3_1-integration --shard 1/2	1m 27s
./dtox.sh -e py38-pip22_3_1	1m 23s
tox -e py313-pip24_3_1-integration --shard 2/2	1m 25s
./dtox.sh -e py311-pip23_3_2	1m 24s
./dtox.sh -e py313-pip24_3_1	1m 25s
./dtox.sh -e py314-pip24_3_1	1m 25s
./dtox.sh -e pypy310-pip24_3_1	1m 24s
./dtox.sh -e py27-pip20-integration	1m 24s
./dtox.sh -e py38-pip22_3_1-integration --shard 1/2	1m 24s
./dtox.sh -e py38-pip22_3_1-integration --shard 2/2	1m 24s
./dtox.sh -e py311-pip23_3_2-integration --shard 1/2	1m 24s
./dtox.sh -e py311-pip23_3_2-integration --shard 2/2	1m 24s
./dtox.sh -e py313-pip24_3_1-integration --shard 1/2	1m 21s
./dtox.sh -e py313-pip24_3_1-integration --shard 2/2	1m 24s
./dtox.sh -e py314-pip24_3_1-integration --shard 1/2	1m 26s
./dtox.sh -e py314-pip24_3_1-integration --shard 2/2	1m 24s
./dtox.sh -e pypy310-pip24_3_1-integration --shard 1/2	1s
./dtox.sh -e pypy310-pip24_3_1-integration --shard 2/2	1s
Gather Final Status	1s
	26m 48s

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