Update tox configuration for version 4

Related to swh/meta#4959 (closed)

enabled an automatic merge when the pipeline for bc462f3a succeeds

mentioned in issue swh/meta#4959 (closed)

Jenkins job DGQL/gitlab-builds #134 failed .
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added 1 commit

• e2325f9f - Update and clean tox configuration for version 4

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Jenkins job DGQL/gitlab-builds #135 succeeded .
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merged