update github actions; add dependabot checking

.github/dependabot.yml

@@ -0,0 +1,9 @@
+---
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: monthly
+    commit-message:
+      prefix: ci

.github/workflows/nightly-update-and-trigger.yml

@@ -2,20 +2,21 @@ name: Trigger a quay.io EE rebuild - update requirements.yml, ansible-builder fi
 on:
   schedule:
     - cron: "37 1 * * *"
+  workflow_dispatch:
 jobs:
   trigger-ee-rebuild:
     runs-on: ubuntu-latest
     name: Trigger a quay.io EE rebuild - update requirements.yml, ansible-builder files
     steps:
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
       - name: Install ansible-builder and ansible
         shell: bash
         run: |
           set -euxo pipefail
           pip install -U ansible-builder ansible
       - name: checkout current repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Trigger a quay.io EE rebuild - update requirements.yml, ansible-builder files
         shell: bash
         run: |