[chore]: support python 3.9+

Author: vectorsss

.github/workflows/build_packages.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.8', '3.10', '3.12']
+        python-version: ['3.9', '3.10', '3.12']
 
     steps:
     - uses: actions/checkout@v3

setup.py

@@ -30,12 +30,12 @@
     url="https://github.com/vectorsss/shapG",
     classifiers=[
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.12",
         "Operating System :: OS Independent",
         "Topic :: Scientific/Engineering :: Mathematics",
         "Topic :: Scientific/Engineering :: Information Analysis",
     ],
-    python_requires='>=3.6',
+    python_requires='>=3.9',
 )