pyproject.toml: downgrade required setuptools_scm version

In order to build an RPM directly from a source tarball on fedora 35 it
appears that we can't use the current version of setuptools_scm.
After some testing-by-hand I don't see any immediate downsides to using
the older version. It's a little hacky to go backwards but now's the
best time to do so since we have never released yet.


Signed-off-by: John Mulligan <[email protected]>

Author: phlogistonjohn

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=42", "wheel", "setuptools_scm>=6.3"]
+requires = ["setuptools>=42", "wheel", "setuptools_scm>=6.0"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools_scm]