Support for more Maven registries

Hello,

I'm working on the [XWiki](https://github.com/xwiki/xwiki-platform/) project, and while checking for security issues on https://osv.dev/, I noticed that some of our maven modules are not listed on https://deps.dev/.

For instance, https://deps.dev/maven/org.xwiki.commons%3Axwiki-commons-collection or https://deps.dev/maven/org.xwiki.rendering%3Axwiki-rendering-macro-content are correctly found.
But, `org.xwiki.platform:xwiki-platform-attachment-api` cannot be found.

Can you confirm that the later is not found because we upload the release on our own [public repository](https://nexus.xwiki.org/nexus/content/repositories/releases/) instead of the central repository?

And if so, is there some way to make our artifacts indexed in https://deps.dev/

Sincerely,
Manuel Leduc