Update asciidoctor.plugins to v4.0.4

Author: renovate[bot]

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 ant = "1.10.15"
 apiguardian = "1.1.2"
 asciidoctorj-pdf = "2.3.19"
-asciidoctor-plugins = "4.0.3" # Check if workaround in documentation.gradle.kts can be removed when upgrading
+asciidoctor-plugins = "4.0.4" # Check if workaround in documentation.gradle.kts can be removed when upgrading
 assertj = "3.27.0"
 bnd = "7.1.0"
 checkstyle = "10.21.1"