Update and clean tox configuration for version 4

Related to swh/meta#4959 (closed)

enabled an automatic merge when the pipeline for 3d2e3a5b succeeds

mentioned in issue swh/meta#4959 (closed)

Jenkins job DJNL/gitlab-builds #3 failed .
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added 1 commit

• f09a392f - Update and clean tox configuration for version 4

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Jenkins job DJNL/gitlab-builds #4 succeeded .
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merged