drop pypy3.10 on pyo3 tests

Author: mattip

.github/workflows/pyo3.yml

@@ -25,7 +25,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python_version: [pypy-3.10-nightly, pypy-3.11-nightly]
+        python_version: [pypy-3.11-nightly]
 
     timeout-minutes: 20