Release: Updates latest.json and grafana/packages/*/package.json (#20734)

* Update latest.json

* Chore: Changes version to canary

* Chore: Changes version to 6.6.0-pre

packages/grafana-ui/package.json

@@ -2,7 +2,7 @@
   "author": "Grafana Labs",
   "license": "Apache-2.0",
   "name": "@grafana/ui",
-  "version": "6.4.0-pre",
+  "version": "6.6.0-pre",
   "description": "Grafana Components Library",
   "keywords": [
     "grafana",
@@ -25,7 +25,7 @@
     "build": "grafana-toolkit package:build --scope=ui"
   },
   "dependencies": {
-    "@grafana/data": "^6.4.0-alpha",
+    "@grafana/data": "^6.6.0-pre",
     "@grafana/slate-react": "0.22.9-grafana",
     "@torkelo/react-select": "2.1.1",
     "@types/react-color": "2.17.0",