drop Python 3.7 and add 3.12 in tox and setup.cfg

Author: mattmilten

setup.cfg

@@ -15,16 +15,16 @@ classifiers =
     Operating System :: OS Independent
     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
     Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
 [options]
 package_dir =
     =src
 packages = find:
-python_requires = >=3.7
+python_requires = >=3.8
 install_requires =
     ipywidgets
     numpy

tox.ini

@@ -4,12 +4,11 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py37,py38,py39,py310,py311,py312,pre-commit,testnb
+envlist = py38,py39,py310,py311,py312,pre-commit,testnb
 isolated_build = True
 
 [gh-actions]
 python =
-    3.7: py37
     3.8: py38
     3.9: py39,pre-commit,testnb
     3.10: py310