upgrade pypy (#1082)

Author: rgbkrk

.github/workflows/main.yml

@@ -49,7 +49,7 @@ jobs:
           - os: windows-latest
             python-version: "3.12"
           - os: ubuntu-latest
-            python-version: "pypy-3.10"
+            python-version: "pypy-3.11"
           - os: ubuntu-latest
             python-version: "3.11"
           - os: macos-latest