Update dependabot.yml

Author: donatj

.github/dependabot.yml

@@ -5,8 +5,12 @@
 
 version: 2
 updates:
-  - package-ecosystem: "composer" # See documentation for possible values
-    directory: "/" # Location of package manifests
-    versioning-strategy: "increase"
-    schedule:
-      interval: "monthly"
+- package-ecosystem: "composer" # See documentation for possible values
+  directory: "/" # Location of package manifests
+  versioning-strategy: "increase"
+  schedule:
+    interval: "monthly"
+- package-ecosystem: "github-actions"
+  directory: "/"
+  schedule:
+    interval: monthly