Remove upper constraint. Ref ionelmc#54.

ionelmc · ionelmc · commit aac09ddd7473 · 2021-11-11T08:28:53.000+02:00
diff --git a/pyproject.toml b/pyproject.toml
@@ -2,5 +2,5 @@
 requires = [
     "setuptools>=30.3.0",
     "wheel",
-    "setuptools_scm>=3.3.1,<6.0",
+    "setuptools_scm>=3.3.1",
 ]
