Remove dependabot for now

Let's wait until https://github.com/dependabot/dependabot-core/issues/2804 is fixed before re-enabling.

.github/dependabot.yml

@@ -1,22 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: pip
-    directory: '/'
-    schedule:
-      interval: daily
-    open-pull-requests-limit: 10
-    labels:
-      - Backend
-      - dependencies
-  - package-ecosystem: docker
-    directory: '/'
-    schedule:
-      interval: daily
-    open-pull-requests-limit: 10
-  # - package-ecosystem: npm
-  #   directory: '/'
-  #   schedule:
-  #     interval: daily
-  #   open-pull-requests-limit: 10
-  #   labels:
-  #     - dependencies