I have enabled Dependabot for a GitHub project of mine: https://github.com/t1/deployer
For a while now, it opens issues that it could not authenticate to JCenter, e.g. https://github.com/t1/deployer/issues/163
I don't want to provide my credentials! Why does it try to do that? I don't remember configuring it to do anything with JCenter. I didn't find any config option, nor anything useful on Google, yet.