[Backport 1.0.latest] Fix #9907: Add retry to tox to reduce flaky tes… #27611

Job	Run time
build packages	18s
flake8	25s
unit test / python 3.7	1m 17s
mypy	49s
unit test / python 3.8	1m 9s
verify packages / python 3.7 / ubuntu-20.04	27s
verify packages / python 3.8 / ubuntu-20.04	35s
verify packages / python 3.7 / macos-12	44s
verify packages / python 3.8 / macos-12	44s
verify packages / python 3.7 / windows-latest	1m 22s
verify packages / python 3.8 / windows-latest	1m 10s
	9m 0s

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