[engsys] fix: Broken next-pylint tox environment

[kdestin]

Description

This PR is a follow up to #30159, and fixes the next-pylint tox environment which was broken by that PR

cc: @scbedd , @l0lawrence

Background

#30159 includes df6b428 which was an attempt to better document the tox environments defined in tox.ini

The commit accidentally removed the pylint== from pylint==2.15.8
(see df6b428#diff-046db483898138bdccf106f32155fe12e3658ff0dd64ff0968507e3ffe15d09bL104-R107 ), which causes installation of pylint to fail.

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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[kdestin]

This had already been fixed by #30515