Use Python 3.10 to build & publish

v3.11 came out recently, but h5py doesn’t support it yet

.github/workflows/publish.yml

@@ -17,7 +17,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: '3.x'
+        python-version: '3.10'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip