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MINOR: [Dev][Archery] Reinstate version constraint on setuptools_scm for comment bot (#40162)

The comment bot depends on an internal setuptools_scm API that was changed in setuptools_scm 8.
We therefore need to reinstate the Archery version constraint that was removed in https://github.com/apache/arrow/pull/40150

See example failure at https://github.com/apache/arrow/actions/runs/7976567301/job/21777437575

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Antoine Pitrou <antoine@python.org>