Merge pull request #14853 from backstage/renovate/actions-setup-python-4.x

Update actions/setup-python action to v4

.github/workflows/verify_e2e-techdocs.yml

@@ -26,7 +26,9 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/setup-python@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.9'
 
       - name: install dependencies
         run: yarn install --immutable

docs/features/techdocs/configuring-ci-cd.md

@@ -145,6 +145,8 @@ jobs:
 
       - uses: actions/setup-node@v3
       - uses: actions/setup-python@v4
+        with:
+          python-version: '3.9'
 
       # the 2 steps below can be removed if you aren't using plantuml in your documentation
       - name: setup java