chore: enable github action auto update in dependabot.yml (#319)

Co-authored-by: Usama Sadiq <usama.sadiq@arbisoft.com>

Author: edx-requirements-bot

.github/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+    # Adding new check for github-actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+        interval: "weekly"