Remove dependabot.yml (#18310)

.github/dependabot.yml

@@ -1,30 +0,0 @@
-# Update dependencies with Dependabot
-
-version: 2
-updates:
-  # Set update schedule for Ruby Bundler
-  - package-ecosystem: "bundler"
-    # Raise pull requests to update vendored dependencies that are checked in to the repository
-    vendor: true
-    directory: "/"
-    schedule:
-      interval: "daily"
-    labels: []
-
-  # Set update schedule for Yarn/NPM
-  - package-ecosystem: "npm"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-    ignore:
-      # Ignoring the update to 4.x for now as it involves a lot of manual work
-      - dependency-name: "webpack-dev-server"
-        versions: ["4.x"]
-    labels: []
-
-  # Set update schedule for GitHub Actions
-  # https://docs.github.com/en/free-pro-team@latest/github/administering-a-repository/keeping-your-actions-up-to-date-with-dependabot
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "daily"