Update Python version support.

Author: icemac

setup.py

@@ -40,11 +40,11 @@ def read(*rnames):
         'License :: OSI Approved :: Zope Public License',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        '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',
         'Programming Language :: Python :: Implementation',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
@@ -54,7 +54,7 @@ def read(*rnames):
     namespace_packages=['grokcore'],
     include_package_data=True,
     zip_safe=False,
-    python_requires='>=3.7',
+    python_requires='>=3.9',
     install_requires=[
         'setuptools',
         'grokcore.component >= 2.1',

src/grokcore/formlib/components.py

@@ -18,6 +18,7 @@
 import warnings
 
 import pytz
+
 from zope.formlib import form
 from zope.interface import implementer_only
 from zope.interface.common import idatetime