Set minimumReleaseAge to 7 days to avoid merge renovate PR quickly (#739)

It doesn't make any sense if all users delay applying the version
upgrade like this, but delaying it compared to others can at least
somewhat help in determining the success of the upgrade and identifying
dangerous/hacked libraries.

Since we don't publish release very frequently, this should be
sufficient.

https://docs.renovatebot.com/configuration-options/#minimumreleaseage

parent: line/line-bot-sdk-nodejs#1387

Author: Yang-33

renovate.json5

@@ -16,6 +16,7 @@
   labels: [
     'dependency upgrade',
   ],
+  minimumReleaseAge : "7 days",
   packageRules: [
     {
       labels: [