Implement PEP-517/518 build system locking. #3336

Job	Run time
Check GitHub Organization	1s
tox -e format-check,lint-check,typecheck,enum-check,vendor-check,package,docs	11m 32s
./dtox.sh -e py27-pip20	9m 12s
./dtox.sh -e py38-pip22_3_1	17m 35s
tox -e py313-pip24_3_1	22m 14s
tox -e py313-pip24_3_1-integration --shard 1/2	41m 0s
./dtox.sh -e py311-pip23_3_2	17m 54s
tox -e py313-pip24_3_1-integration --shard 2/2	30m 57s
./dtox.sh -e py313-pip24_3_1	13m 6s
./dtox.sh -e py314-pip24_3_1	13m 26s
./dtox.sh -e pypy310-pip24_3_1	28m 35s
./dtox.sh -e py27-pip20-integration	29m 13s
./dtox.sh -e py38-pip22_3_1-integration --shard 1/2	27m 48s
./dtox.sh -e py38-pip22_3_1-integration --shard 2/2	29m 25s
./dtox.sh -e py311-pip23_3_2-integration --shard 1/2	28m 1s
./dtox.sh -e py311-pip23_3_2-integration --shard 2/2	25m 53s
./dtox.sh -e py313-pip24_3_1-integration --shard 1/2	25m 45s
./dtox.sh -e py313-pip24_3_1-integration --shard 2/2	24m 12s
./dtox.sh -e py314-pip24_3_1-integration --shard 1/2	25m 5s
./dtox.sh -e py314-pip24_3_1-integration --shard 2/2	24m 22s
./dtox.sh -e pypy310-pip24_3_1-integration --shard 1/2	55m 9s
./dtox.sh -e pypy310-pip24_3_1-integration --shard 2/2	49m 10s
Gather Final Status	1s
	9h 9m 36s

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