I have been developing a LibGDX application and already published (several versions of) it in Google Play store in the past.

I am now trying to create a new release in Play Console, but I'm getting error:

This release uses v1 of the Play Games services SDK, com.google.android.gms:play-services-games, which is not available for new integrations. Migrate to v2 to create a release.

There is also a link to an article that should give more information: The first step in that guide is

In your module's build.gradle file, find this line in the module level dependencies. implementation "com.google.android.gms:play-services-games-v1:+"

I don't have that line in any of the build.gradle files. If I search the entire project for "com.google.android.gms:play-services" I don't get any results. I have not (at least intentionally) ever used any version of Play Games Services, and I don't want to use it either. Until last week I was able to create new releases of the same app without errors, and I have not modified anything in any Gradle file since that (except for the app's own version numbers).

If I try to google the error message as such, I don't get any results. I have some bugs in my app that I would like to fix with the new release, but now can't because of this. How can I get it fixed?