Remove dependabot for Python deps

.github/dependabot.yml

@@ -1,13 +1,5 @@
 version: 2
 updates:
-  - package-ecosystem: pip
-    directory: '/requirements'
-    schedule:
-      interval: monthly
-    open-pull-requests-limit: 20
-    labels:
-      - Backend
-      - dependencies
   - package-ecosystem: docker
     directory: '/'
     schedule: