Update actions to eliminate Node v12 deprecation warnings

Author: petergoldstein

.github/workflows/ruby.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Linter
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
@@ -21,7 +21,7 @@ jobs:
       - name: Validate YAML
         run: bundle exec rake lint
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: 3.8
       - name: Install python dependencies