chore: drop python 3.7 for cibuildwheel driver

This drops python 3.7 for cibuildwheel.
Building python 3.6 / 3.7 packages is still supported.

setup.cfg

@@ -16,7 +16,6 @@ classifiers =
     Natural Language :: English
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3 :: Only
-    Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
@@ -39,7 +38,7 @@ install_requires =
     platformdirs
     tomli;python_version < '3.11'
     typing-extensions>=4.1.0;python_version < '3.11'
-python_requires = >=3.7
+python_requires = >=3.8
 include_package_data = True
 zip_safe = False