build: added reviewers in dependabot config (#1067)

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

Author: edx-requirements-bot

.github/dependabot.yml

@@ -5,3 +5,5 @@ updates:
     directory: "/"
     schedule:
         interval: "weekly"
+    reviewers:
+      - "openedx/arbi-bom"