Replace pylint-strict-informational with fail-on=I

[scop]

Proposed change

fail-on is available since pylint 2.9.0.

https://pylint.pycqa.org/en/latest/user_guide/configuration/all-options.html#fail-on
pylint-dev/pylint#3251 (comment)

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[frenck]

Rebased to deal with the CI issue