ci: drop PyPy 3.9, add PyPy 3.11

The 3.9 build is failing for reasons unknown. Only 3.11 is officially
supported. But 3.10 is still working for now.

So let's drop 3.9 and add 3.11.

Author: indygreg

.github/workflows/pypy.yml

@@ -51,8 +51,8 @@ jobs:
           - 'macos-13'
           - 'windows-2022'
         py:
-          - 'pypy-3.9'
           - 'pypy-3.10'
+          - 'pypy-3.11'
         arch:
           - 'x86'
           - 'x64'

docs/news.rst

@@ -63,6 +63,8 @@ Changes
 * We now `collections.abs.Buffer` on Python 3.12+ instead of `typing.ByteString`,
   as `typing.ByteString` was deprecated and later removed. (#238, #262)
 * PyO3 Rust crate upgraded from 0.21 to 0.22 (#257) and later to 0.24.
+* Removed CI coverage for PyPy 3.9.
+* Added CI coverage for PyPy 3.11.
 
 Backwards Compatibility Notes
 -----------------------------