Implement pex3 lock sync. #2515

Job	Run time
Check GitHub Organization	1s
./dtox.sh -e py27-pip20	12m 52s
tox -e format-check,lint-check,typecheck,vendor-check,package,docs	5m 53s
tox -e py312-pip24_0	19m 31s
./dtox.sh -e py37-pip20	16m 40s
tox -e py312-pip24_0-integration	1h 12m 23s
./dtox.sh -e py311-pip20	15m 22s
./dtox.sh -e py311-pip22_3_1	15m 33s
./dtox.sh -e py311-pip23_1_2	16m 47s
./dtox.sh -e py312-pip24_0	15m 52s
./dtox.sh -e py313-pip24_0_patched	14m 58s
./dtox.sh -e pypy310-pip20	26m 46s
./dtox.sh -e pypy310-pip22_3_1	26m 8s
./dtox.sh -e pypy310-pip23_1_2	25m 51s
./dtox.sh -e py27-pip20-integration	21m 55s
./dtox.sh -e py37-pip22_3_1-integration	41m 55s
./dtox.sh -e py37-pip23_1_2-integration	42m 24s
./dtox.sh -e py311-pip20-integration	23m 16s
./dtox.sh -e py311-pip22_3_1-integration	27m 31s
./dtox.sh -e py311-pip23_1_2-integration	27m 41s
./dtox.sh -e py312-pip24_0-integration	36m 42s
./dtox.sh -e py313-pip24_0_patched-integration	41m 12s
./dtox.sh -e pypy310-pip20-integration	46m 0s
./dtox.sh -e pypy310-pip22_3_1-integration	51m 52s
./dtox.sh -e pypy310-pip23_1_2-integration	49m 42s
Gather Final Status	1s
	11h 34m 48s

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