[deps] renovatebot for bazel deps

*Title*: *renovatebot for bazel deps*

*Description*:
I recently came across this project https://github.com/renovatebot/renovate that states it has support for updating http_archives and other bazel deps. I'm curious if anyone has heard or tried it, and has any opinions on whether it might work.

I worry that
* It will not handle our `repository_locations.bzl` and our metadata format
* It will have too much noise or sense of priority, and will not be helpful in case dependency updates require changes and fixes in the repo

Ideally, it seems like we want a tool on top of it that can handle priority and being compliant with formatting. There are already warnings on new releases that appear in CI logs. (Another improvement would be making those warnings more visible)