chore: refresh PyPy CI matrix to maintained versions

PyPy 3.8 reached end-of-life in October 2024 and was the only PyPy
line we tested. PyPy 3.9's last release was April 2024 and is
effectively EOL too. Per upstream (downloads.python.org/pypy):

- pypy-3.10  last release 2025-02-26  (maintained)
- pypy-3.11  last release 2026-03-13  (current stable)

Drop pypy38 jobs and replace with pypy310 and pypy311, mirroring the
existing 3-OS pattern (ubuntu, windows, macos).

- tox.ini: envlist swap pypy38 -> pypy310, pypy311; same swap in the
  basepython block.
- .github/workflows/github-actions.yml: 3 pypy38 jobs out, 6 new ones
  (2 versions x 3 OSes) in the matrix include list.

setup.py classifiers don't enumerate PyPy minor versions
(`Implementation :: PyPy`), so no metadata change needed.

Closes #36

2 files changed, 32 insertions, 14 deletions

diff --git a/.github/workflows/github-actions.yml b/.github/workflows/github-actions.yml
index 1af692a..24a45eb 100644
--- a/.github/workflows/github-actions.yml
+++ b/.github/workflows/github-actions.yml
@@ -87,22 +87,39 @@ jobs:
             toxpython: 'python3.11'
             tox_env: 'py311'
             os: 'macos-latest'
-          - name: 'pypy38 (ubuntu)'
-            python: 'pypy-3.8'
-            toxpython: 'pypy3.8'
+          - name: 'pypy310 (ubuntu)'
+            python: 'pypy-3.10'
+            toxpython: 'pypy3.10'
             python_arch: 'x64'
-            tox_env: 'pypy38'
+            tox_env: 'pypy310'
             os: 'ubuntu-latest'
-          - name: 'pypy38 (windows)'
-            python: 'pypy-3.8'
-            toxpython: 'pypy3.8'
+          - name: 'pypy310 (windows)'
+            python: 'pypy-3.10'
+            toxpython: 'pypy3.10'
             python_arch: 'x64'
-            tox_env: 'pypy38'
+            tox_env: 'pypy310'
             os: 'windows-latest'
-          - name: 'pypy38 (macos)'
-            python: 'pypy-3.8'
-            toxpython: 'pypy3.8'
-            tox_env: 'pypy38'
+          - name: 'pypy310 (macos)'
+            python: 'pypy-3.10'
+            toxpython: 'pypy3.10'
+            tox_env: 'pypy310'
+            os: 'macos-latest'
+          - name: 'pypy311 (ubuntu)'
+            python: 'pypy-3.11'
+            toxpython: 'pypy3.11'
+            python_arch: 'x64'
+            tox_env: 'pypy311'
+            os: 'ubuntu-latest'
+          - name: 'pypy311 (windows)'
+            python: 'pypy-3.11'
+            toxpython: 'pypy3.11'
+            python_arch: 'x64'
+            tox_env: 'pypy311'
+            os: 'windows-latest'
+          - name: 'pypy311 (macos)'
+            python: 'pypy-3.11'
+            toxpython: 'pypy3.11'
+            tox_env: 'pypy311'
             os: 'macos-latest'
           - name: 'py312 (ubuntu)'
             python: '3.12'
diff --git a/tox.ini b/tox.ini
index 94a695a..c87143a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,13 +14,14 @@ envlist =
     clean,
     check,
     docs,
-    {py38,py39,py310,py311,py312,py313,py314,pypy38},
+    {py38,py39,py310,py311,py312,py313,py314,pypy310,pypy311},
     report
 ignore_basepython_conflict = true
 
 [testenv]
 basepython =
-    pypy38: {env:TOXPYTHON:pypy3.8}
+    pypy310: {env:TOXPYTHON:pypy3.10}
+    pypy311: {env:TOXPYTHON:pypy3.11}
     py38: {env:TOXPYTHON:python3.8}
     py39: {env:TOXPYTHON:python3.9}
     py310: {env:TOXPYTHON:python3.10}