Merge pull request #361 from bknueven/pypi_release_workflow

update PyPI workflow

.github/workflows/publish-to-test-pypi.yml

@@ -8,13 +8,13 @@ on:
 jobs:
   build-n-publish:
     name: Build and publish Python distributions to PyPI and TestPyPI
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@main
-    - name: Set up Python 3.8
+    - name: Set up Python 3.11
       uses: actions/setup-python@v1
       with:
-        python-version: 3.8
+        python-version: 3.11
     - name: Install mpi-sppy 
       run: |
         python -m pip install --user --upgrade setuptools wheel