Replace Dependabot with Renovate

.github/dependabot.yml

@@ -1,17 +0,0 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
-# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
-
-version: 2
-updates:
-  - package-ecosystem: "gradle" # See documentation for possible values
-    directory: "/" # Location of package manifests
-    schedule:
-      interval: "daily"
-    assignees:
-      - "p3k"
-    groups:
-      jetty:
-        patterns:
-          - 'org.eclipse.jetty:*'