fix: remove PyPy 3.10 from test matrix

PyPy 3.10 jobs are failing because PyO3 (required by nh3 package) now
requires PyPy 3.11 as the minimum version.

Error from CI:
  error: the configured PyPy interpreter version (3.10) is lower than
  PyO3's minimum supported version (3.11)

Changes:
- Remove pypy310 from tox.ini envlist
- Remove pypy310 basepython definition
- Remove 4 pypy310 jobs from GitHub Actions workflow:
  - pypy310-pydantic28-cover
  - pypy310-pydantic210-cover
  - pypy310-pydantic28-nocov
  - pypy310-pydantic210-nocov

PyPy 3.9 jobs continue to work and remain in the test matrix.

Fixes failing CI builds on main branch.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: jontsai

.github/workflows/github-actions.yml

@@ -91,30 +91,6 @@ jobs:
             python_arch: 'x64'
             tox_env: 'py312-pydantic210-nocov'
             os: 'ubuntu-latest'
-          - name: 'pypy310-pydantic28-cover'
-            python: 'pypy-3.10'
-            toxpython: 'pypy3.10'
-            python_arch: 'x64'
-            tox_env: 'pypy310-pydantic28-cover'
-            os: 'ubuntu-latest'
-          - name: 'pypy310-pydantic210-cover'
-            python: 'pypy-3.10'
-            toxpython: 'pypy3.10'
-            python_arch: 'x64'
-            tox_env: 'pypy310-pydantic210-cover'
-            os: 'ubuntu-latest'
-          - name: 'pypy310-pydantic28-nocov'
-            python: 'pypy-3.10'
-            toxpython: 'pypy3.10'
-            python_arch: 'x64'
-            tox_env: 'pypy310-pydantic28-nocov'
-            os: 'ubuntu-latest'
-          - name: 'pypy310-pydantic210-nocov'
-            python: 'pypy-3.10'
-            toxpython: 'pypy3.10'
-            python_arch: 'x64'
-            tox_env: 'pypy310-pydantic210-nocov'
-            os: 'ubuntu-latest'
     steps:
     - uses: actions/checkout@v4
       with:

tox.ini

@@ -14,15 +14,14 @@ envlist =
     clean,
     check,
     docs,
-    {py39,py310,py311,py312,pypy39,pypy310}-{pydantic28,pydantic210}-{cover,nocov},
+    {py39,py310,py311,py312,pypy39}-{pydantic28,pydantic210}-{cover,nocov},
     report
 ignore_basepython_conflict = true
 
 [testenv]
 basepython =
     pypy38: {env:TOXPYTHON:pypy3.8}
     pypy39: {env:TOXPYTHON:pypy3.9}
-    pypy310: {env:TOXPYTHON:pypy3.10}
     py38: {env:TOXPYTHON:python3.8}
     py39: {env:TOXPYTHON:python3.9}
     py310: {env:TOXPYTHON:python3.10}