Relax the install_requires, no need to exact version as long as there are no broken changes with future versions

[qiluo-msft]

What I did

Fixes sonic-net/sonic-buildimage#7152

How I did it

Relax the install_requires

How to verify it

Previous command output (if the output of a command-line utility has changed)

New command output (if the output of a command-line utility has changed)

[jleveque]

Two questions:

1. What about backporting to the 202012 branch?
2. How can we be certain there are no broken changes with future versions? That was the whole reason for pinning the versions down -- to prevent newer versions getting installed and potentially breaking things.

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In reply to: 808638168

[qiluo-msft]

1. I added 'request' label for old branch.
2. When that happens, we could add new requirement rule to enforce the dependency. On the other hand, pinning down is too conservative, and we need to make sure the host environment or docker already installed the required version, otherwise, there will be upgrade/downgrade, which is confusing.

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In reply to: 808638168

[jleveque]

Sorry, I misled you. You can revert your last commit. We cannot bump it up just yet, because it conflicts with the sonic-py-common and sonic-platform-common packages, which still install 6.2.1 because they still support Python 2. Thus, we need to remain back on 6.2.1 for now.

pkg_resources.ContextualVersionConflict: (natsort 7.1.1 (/__w/1/s/.eggs/natsort-7.1.1-py3.7.egg), Requirement.parse('natsort==6.2.1'), {'sonic-py-common', 'sonic-platform-common'})

[jleveque]

/azp run

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