chore: Add tox<4.0.0 to containts.txt

[ZiqiXiao]

Add tox<4.0.0 to containts.txt for public-engineering#217

Reviewers:

• @feanil

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[feanil]

@ZiqiXiao did you run make upgrade after you constraints change? I realized after the review of the other PR that there will be changes in other requirements files based on the change in the constraints file.

[ZiqiXiao]

@ZiqiXiao did you run make upgrade after you constraints change? I realized after the review of the other PR that there will be changes in other requirements files based on the change in the constraints file.

No. I didn't run that check. I will do it and let you know the result.

@feanil I run make upgrade, there are indeed some requirements files changed. I will make make a new pull request after running make upgrade. And I will check api-doc-tools, which I created a PR and was merged already, to make sure changed files are included and create a new PR.

[ZiqiXiao]

@feanil I have rerun make upgrade with Python 3.8 please review it. Thx👀

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