Use dependabot to check action versions.

Author: Codex-

.github/dependabot.yml

@@ -1,9 +1,11 @@
 version: 2
 updates:
-  # Enable version updates for npm
-  - package-ecosystem: 'npm'
-    # Look for `package.json` and `lock` files in the `root` directory
-    directory: '/'
-    # Check the npm registry for updates every day (weekdays)
+  - package-ecosystem: github-actions
+    directory: /
     schedule:
-      interval: 'monthly'
+      interval: monthly
+
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: monthly