Drop support for end-of-life Python versions

Author: bmerry

.github/workflows/test.yml

@@ -4,10 +4,10 @@ on: [push]
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v4

setup.cfg

@@ -17,7 +17,7 @@ classifiers =
 package_dir =
     = src
 packages = find:
-python_requires = >= 3.6
+python_requires = >= 3.8
 
 [options.packages.find]
 where = src