Migrate Dependabot to Renovate (#767)

* Migrate dependabot to renovate

* Remove 3-day stability from package rules

* Disable Renovate Dependency Dashboard creation

* Fix syntax to disable dashboard

Author: leungkinghin-ct

.dependabot/config.yml

@@ -0,0 +1,10 @@
+{
+  "extends": [
+    "config:base",
+    ":disableDependencyDashboard"
+  ],
+  "automerge": true,
+  "schedule": [
+    "every weekend"
+  ]
+}