bump version for slackbot-proxy

packages/slackbot-proxy/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@growi/slackbot-proxy",
-  "version": "4.4.6-RC.0",
+  "version": "4.4.6-slackbot-proxy.0",
   "license": "MIT",
   "scripts": {
     "build": "yarn tsc && tsc-alias -p tsconfig.build.json",