Try out AssertJ 4.0.0-M1

Author: marcphilipp

gradle/libs.versions.toml

@@ -3,7 +3,7 @@ ant = "1.10.15"
 apiguardian = "1.1.2"
 asciidoctorj-pdf = "2.3.19"
 asciidoctor-plugins = "4.0.4" # Check if workaround in documentation.gradle.kts can be removed when upgrading
-assertj = "3.27.3"
+assertj = "4.0.0-M1"
 bnd = "7.1.0"
 checkstyle = "10.25.0"
 eclipse = "4.36.0"