pyproject.toml: drop hint about python 3.8 support

We only support Sphinx installs that run on Python 3.9+.

Signed-off-by: James Knight <[email protected]>

Author: jdknight

pyproject.toml

@@ -27,7 +27,6 @@ classifiers = [
     'Programming Language :: Python',
     'Programming Language :: Python :: 3 :: Only',
     'Programming Language :: Python :: 3',
-    'Programming Language :: Python :: 3.8',
     'Programming Language :: Python :: 3.9',
     'Programming Language :: Python :: 3.10',
     'Programming Language :: Python :: 3.11',