Use dependabot for GitHub Actions

.github/dependabot.yml

@@ -0,0 +1,20 @@
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "PR: dependency 📦"
+    groups:
+      major_updates:
+        update-types:
+        - "major"
+      non_major_updates:
+        update-types:
+        - "minor"
+        - "patch
+