Upgrade min version of Setuptools to 61.0.0

Configuring Setuptools using 'pyproject.toml' files is available since
version 61.0.0.

See https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html.

Author: SkypLabs

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools >= 42", "wheel"]
+requires = ["setuptools >= 61", "wheel"]
 build-backend = "setuptools.build_meta"
 
 [project]