Fix redis version during pip3 install #9329
Merged
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Why I did it
Backport #9317 to 202012 branch.
The recent release of redis 4.0.0 or newer (for python3) breaks sonic-config-engine unit test. Fix to last known good version.
ref: https://pypi.org/project/redis/#history
How I did it
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Description for the changelog
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