chore(ci): update pants to 2.21.0dev6
and remove no longer used ruff_preview plugin
#2016
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This reverts changes from #2008 and updates pants' version to
2.21.0dev6
. I have observed pantsbuild/pants#20765 is fixed at the very latest experimental version of pants, so it is now safe to apply changes from #2006.Checklist: (if applicable)