Remove 5.2.1 from compatibility testing as Kotlin DSL is broken
Remove 5.2.1 from compatibility testing as Kotlin DSL is broken

asciidoctor/asciidoctor-gradle-plugin,ysb33r/asciidoctor-gradle-plugin,ysb33r/asciidoctor-gradle-plugin,asciidoctor/asciidoctor-gradle-plugin,asciidoctor/asciidoctor-gradle-plugin,asciidoctor/asciidoctor-gradle-plugin,ysb33r/asciidoctor-gradle-plugin,ysb33r/asciidoctor-gradle-plugin,asciidoctor/asciidoctor-gradle-plugin,ysb33r/asciidoctor-gradle-plugin