Add GitHub Actions to Dependabot configuration

Added configuration for GitHub Actions updates to Dependabot.

Author: sd416

.github/dependabot.yml

@@ -9,3 +9,9 @@ updates:
     directory: "/" # Location of package manifests
     schedule:
       interval: "monthly"
+      
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      # Check for updates to GitHub Actions every week
+      interval: "weekly"