Update dependency com.puppycrawl.tools:checkstyle to v10.21.2 (#4274)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

gradle/libs.versions.toml

@@ -5,7 +5,7 @@ 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"
 bnd = "7.1.0"
-checkstyle = "10.21.1"
+checkstyle = "10.21.2"
 eclipse = "4.34.0"
 jackson = "2.18.2"
 jacoco = "0.8.12"