jcenter is down and going away
Switch to mavenCentral as jcenter has reached end of life https://jfrog.com/blog/into-the-sunset-bintray-jcenter-gocenter-and-chartcenter/ and seems to be completely down today (status.jcenter.com).
Last build failed: https://gitlab.com/gitlab-org/security-products/analyzers/gemnasium-gradle-plugin/-/pipelines/446788748
Edited by Igor Frenkel