env: Update supports

- Drop python 3.8
- Add python 3.12, 3.13

.github/workflows/main.yml

@@ -22,10 +22,11 @@ jobs:
     strategy:
       matrix:
         python-version:
-          - '3.8'
           - '3.9'
           - '3.10'
           - '3.11'
+          - '3.12'
+          - '3.13'
         workspace: ['locked', 'latest']
     steps:
       - uses: actions/checkout@v4

.python-version

@@ -1 +1 @@
-3.8
+3.9

pyproject.toml

@@ -12,10 +12,11 @@ classifiers = [
   "Framework :: Sphinx :: Extension",
   "Intended Audience :: Developers",
   "License :: OSI Approved :: Apache Software License",
-  "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",
   "Topic :: Documentation :: Sphinx",
 ]
 readme = "README.rst"
@@ -25,7 +26,7 @@ dependencies = [
   "sphinx",
 ]
 dynamic = ["version", "description"]
-requires-python = ">= 3.8"
+requires-python = ">= 3.9"
 
 [project.optional-dependencies]
 doc = [