add pypy3.10

Author: dholth

.github/workflows/upload-pypi-source.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.11", "3.12", pypy3.9]
+        python-version: ["3.11", "3.12", "pypy3.9" "pypy3.10"]
 
     steps:
     - uses: actions/checkout@v3