Relax setuptools requirement to allow for easier Debian packaging on …

…Ubuntu Focal & Jammy

setup.py

@@ -65,7 +65,7 @@ def run_tests(self):
     zip_safe=False,
     platforms="any",
     python_requires=">=3.8",
-    setup_requires=["setuptools>=61.0"],
+    setup_requires=["setuptools>=45.2"],
     classifiers=[
         "Development Status :: 5 - Production/Stable",
         "Environment :: Console",