Update python_requires to >=3.8

This is necessary since we have dropped support for Python 3.7.

Co-authored-by: David Harris <123905168+dv4harr10@users.noreply.github.com>

Author: jsf9k

setup.py

@@ -82,7 +82,7 @@ def get_version(version_file):
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: Implementation :: CPython",
     ],
-    python_requires=">=3.7",
+    python_requires=">=3.8",
     # What does your project relate to?
     keywords="skeleton",
     packages=find_packages(where="src"),