Fixes to release-artifacts warnings (#14224)

.github/workflows/release-artifacts.yml

@@ -27,6 +27,8 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
       - id: set-distros
         run: |
           # if we're running from a tag, get the full list of distros; otherwise just use debian:sid
@@ -70,6 +72,8 @@ jobs:
 
       - name: Set up python
         uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
 
       - name: Build the packages
         # see https://github.com/docker/build-push-action/issues/252