DiKTat's maven coordinate had been changed from org.cqfn.diktat:diktat-rules to com.saveourtool.diktat:diktat-rules, it's 2.0.0 RC state for now, we can support it and drop the support for 1.x versions.

https://github.com/saveourtool/diktat/releases/tag/v2.0.0-rc.8
https://central.sonatype.com/search?q=com.saveourtool.diktat