Work around quirk in YAML parsing

Types are defined by the file, not by a schema, no `3.10` is treated as
a float and is equal to `3.1`.

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
 
       - uses: actions/setup-python@v3
         with:
-          python-version: 3.10
+          python-version: "3.10"
 
       - name: Install dependencies
         run: |