Fix `--venv` cached Python interpreter info. (#2579) #3132

Job	Run time
Check GitHub Organization	1s
tox -e format-check,lint-check,typecheck,vendor-check,package,docs	8m 38s
tox -e py313-pip24_2	15m 56s
tox -e py313-pip24_2-integration --shard 1/2	24m 10s
./dtox.sh -e py27-pip20	9m 33s
tox -e py313-pip24_2-integration --shard 2/2	28m 5s
./dtox.sh -e py38-pip22_3_1	17m 17s
./dtox.sh -e py311-pip23_3_2	18m 26s
./dtox.sh -e py313-pip24_2	13m 54s
./dtox.sh -e py314-pip24_2	12m 20s
./dtox.sh -e pypy310-pip24_2	27m 2s
./dtox.sh -e py27-pip20-integration	27m 41s
./dtox.sh -e py38-pip22_3_1-integration --shard 1/2	27m 43s
./dtox.sh -e py38-pip22_3_1-integration --shard 2/2	28m 16s
./dtox.sh -e py311-pip23_3_2-integration --shard 1/2	27m 16s
./dtox.sh -e py311-pip23_3_2-integration --shard 2/2	28m 53s
./dtox.sh -e py313-pip24_2-integration --shard 1/2	27m 31s
./dtox.sh -e py313-pip24_2-integration --shard 2/2	26m 21s
./dtox.sh -e py314-pip24_2-integration --shard 1/2	24m 2s
./dtox.sh -e py314-pip24_2-integration --shard 2/2	25m 5s
./dtox.sh -e pypy310-pip24_2-integration --shard 1/2	44m 30s
./dtox.sh -e pypy310-pip24_2-integration --shard 2/2	49m 4s
Gather Final Status	1s
	8h 31m 45s

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