Specify 3.12 as supported

Author: pgleeson

setup.cfg

@@ -16,7 +16,6 @@ classifiers =
     License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)
     Natural Language :: English
     Operating System :: OS Independent
-    Programming Language :: Python :: 3.7
     Topic :: Scientific/Engineering
     Intended Audience :: Science/Research
     Programming Language :: Python
@@ -26,6 +25,7 @@ classifiers =
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
     Topic :: Scientific/Engineering
     Topic :: Software Development
     Typing :: Typed