Drop old Python versions and add Python 3.13

Author: nicoddemus

setup.py

@@ -27,9 +27,9 @@ def read(fname):
         'random_order',
     ],
     include_package_data=True,
-    python_requires=">=3.5.0",
+    python_requires=">=3.9",
     install_requires=[
-        'pytest>=3.0.0',
+        'pytest',
     ],
     classifiers=[
         'Development Status :: 5 - Production/Stable',
@@ -38,14 +38,11 @@ def read(fname):
         'Topic :: Software Development :: Testing',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
+        'Programming Language :: Python :: 3.13',
         'License :: OSI Approved :: MIT License',
     ],
     keywords='pytest random test order shuffle',