Bump compat target to 3.8 in setup.py and Github CI

Author: inducer

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
         -
             uses: actions/setup-python@v4
             with:
-                python-version: '3.x'
+                python-version: '3.8'
         -   name: "Main Script"
             run: |
                 curl -L -O https://gitlab.tiker.net/inducer/ci-support/raw/main/prepare-and-run-flake8.sh
@@ -29,7 +29,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                python-version: ['3.6', '3.7', '3.x']
+                python-version: ['3.8', '3.9', '3.x']
         steps:
         -   uses: actions/checkout@v3
         -

setup.py

@@ -18,7 +18,7 @@
           'Topic :: Utilities',
           ],
 
-      python_requires="~=3.6",
+      python_requires="~=3.8",
       install_requires=[
           "ply>=3.4",
           "pycparser>=2.18,<=2.20",