Upgrade vendored packaging dependencies. #3350

Job	Run time
Check GitHub Organization	1s
tox -e format-check,lint-check,typecheck,enum-check,vendor-check,package,docs	9m 40s
./dtox.sh -e py27-pip20	9m 36s
tox -e py313-pip25_0	16m 44s
./dtox.sh -e py38-pip22_3_1	18m 37s
tox -e py313-pip25_0-integration --shard 1/2	34m 7s
./dtox.sh -e py311-pip23_3_2	18m 50s
tox -e py313-pip25_0-integration --shard 2/2	30m 8s
./dtox.sh -e py313-pip25_0	14m 18s
./dtox.sh -e py314-pip25_0	13m 49s
./dtox.sh -e pypy310-pip24_3_1	29m 37s
./dtox.sh -e py27-pip20-integration	29m 31s
./dtox.sh -e py38-pip22_3_1-integration --shard 1/2	29m 31s
./dtox.sh -e py38-pip22_3_1-integration --shard 2/2	27m 42s
./dtox.sh -e py311-pip23_3_2-integration --shard 1/2	28m 39s
./dtox.sh -e py311-pip23_3_2-integration --shard 2/2	27m 9s
./dtox.sh -e py313-pip25_0-integration --shard 1/2	26m 34s
./dtox.sh -e py313-pip25_0-integration --shard 2/2	26m 1s
./dtox.sh -e py314-pip25_0-integration --shard 1/2	24m 47s
./dtox.sh -e py314-pip25_0-integration --shard 2/2	27m 28s
./dtox.sh -e pypy310-pip24_3_1-integration --shard 1/2	55m 13s
./dtox.sh -e pypy310-pip24_3_1-integration --shard 2/2	51m 54s
Gather Final Status	1s
	9h 9m 57s

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