chore: update supported versions (#342)

- Python 3.9 is no longer supported
- PyPy 3.11 is the only currently supported version

Refs: https://peps.python.org/pep-0596/#lifespan
Refs: #334 (comment)

Signed-off-by: Mike Fiedler <[email protected]>

Author: miketheman

.github/workflows/ci.yml

@@ -7,10 +7,7 @@ jobs:
     strategy:
       matrix:
         python-version:
-          - "pypy-3.9"
-          - "pypy-3.10"
           - "pypy-3.11"
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"

pyproject.toml

@@ -24,7 +24,6 @@ classifiers = [
   "Programming Language :: Python",
   "Programming Language :: Python :: 3",
   "Programming Language :: Python :: 3 :: Only",
-  "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
@@ -34,7 +33,7 @@ classifiers = [
   "Programming Language :: Python :: Implementation :: PyPy",
   "Typing :: Typed"
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 
 [project.optional-dependencies]
 md = ["cmarkgfm>=0.8.0"]

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 envlist =
-    py{39, 310, 311, 312, 313, 314}
-    pypy{39, 310, 311}
+    py{310, 311, 312, 313, 314}
+    pypy{311}
     pep8
     packaging
     noextra