MAINT: Bump to 3.9 req

.github/workflows/run-mayavi-tests.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-13]
-        python-version: ['3.8']
+        python-version: ['3.9']
         qt-api: ['pyqt5']
         vtk: ['vtk<9.3']
         include:

setup.py

@@ -325,7 +325,7 @@ def run(self):
         author="Prabhu Ramachandran, et al.",
         author_email="[email protected]",
         maintainer='ETS Developers',
-        python_requires='>=3.8',
+        python_requires='>=3.9',
         maintainer_email='[email protected]',
         url='http://docs.enthought.com/mayavi/mayavi/',
         classifiers=[c.strip() for c in """\