remove dependabot

.github/dependabot.yml

-# version: 2
-# updates:
-#   - package-ecosystem: "npm"
-#     directory: "/frontend"
-#     schedule:
-#       interval: "weekly"
-#   - package-ecosystem: "npm"
-#     directory: "/server"
-#     schedule:
-#       interval: "weekly"
-#   - package-ecosystem: "npm"
-#     directory: "/collector"
-#     schedule:
-#       interval: "weekly"
-#   - package-ecosystem: "github-actions"
-#     directory: "/"
-#     schedule:
-#       interval: "weekly"