chore: switch dependabot, reviewers and email to arch-bom

Author: vgulati-apphelix

.github/dependabot.yml

@@ -6,4 +6,4 @@ updates:
     schedule:
         interval: "weekly"
     reviewers:
-      - "openedx/arch-bom"
+      - "openedx/2u-arch-bom"

.github/workflows/upgrade-python-requirements.yml

@@ -13,7 +13,7 @@ jobs:
    call-upgrade-python-requirements-workflow:
     with:
        branch: ${{ github.event.inputs.branch || 'master' }}
-       team_reviewers: "arch-bom"
+       team_reviewers: "2u-arch-bom"
        email_address: [email protected]
        send_success_notification: false
     secrets: