chore: remove dependabot version-update config

themes/tsuki/.github/dependabot.yml

@@ -1,21 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: npm
-    directory: /
-    schedule:
-      interval: weekly
-      day: monday
-    open-pull-requests-limit: 5
-    labels:
-      - dependencies
-      - npm
-
-  - package-ecosystem: github-actions
-    directory: /
-    schedule:
-      interval: weekly
-      day: monday
-    open-pull-requests-limit: 5
-    labels:
-      - dependencies
-      - github-actions