Removes dependabot for opening ui dependency pr's (#14075)

.github/dependabot.yml

@@ -1,19 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: "npm"
-    directory: "/awx/ui"
-    schedule:
-      interval: "monthly"
-    open-pull-requests-limit: 5
-    allow:
-      - dependency-type: "production"
-    reviewers:
-      - "AlexSCorey"
-      - "keithjgrant"
-      - "kialam"
-      - "mabashian"
-      - "marshmalien"
-    labels:
-      - "component:ui"
-      - "dependencies"
-    target-branch: "devel"