Add a lower bound pin on setuptools dependency

[mayeut]

mitigates #921

The docs and the checks are still inconsistent (setuptools>=61 & setuptools>=64 are used depending on checks or doc).
This aligns the runtime dependency with the check.

[mayeut]

re-reading #921, the doc says:

setuptools-scm/docs/index.md

Lines 19 to 20 in 3c145df

	Note: `setuptools-scm>=8` intentionally doesn't depend on setuptools to ease non-setuptools usage.
	Please ensure a recent version of setuptools (>=64) is installed.

If the intent of leaving a lower bound blank was for this, then this PR should probably be closed while waiting for one that actually removes the dependency and/or update the check to only run when called from setuptools entrypoints ?