[Backport 1.0.latest] Fix #9907: Add retry to tox to reduce flaky tests due to network failures #27614

Job	Run time
build packages	15s
flake8	32s
unit test / python 3.7	1m 13s
mypy	56s
unit test / python 3.8	1m 8s
verify packages / python 3.7 / ubuntu-20.04	31s
verify packages / python 3.8 / ubuntu-20.04	28s
verify packages / python 3.7 / macos-12	47s
verify packages / python 3.8 / macos-12	48s
verify packages / python 3.7 / windows-latest	2m 0s
verify packages / python 3.8 / windows-latest	1m 14s
	9m 52s

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