chore(deps): update dependency org.jetbrains.kotlin.jvm to v2.1.21 (#174)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 detekt = "1.23.8"
-kotlin = "2.1.20"
+kotlin = "2.1.21"
 ktlintGradle = "12.2.0"
 pluginPublish = "1.3.1"
 versionCheck = "0.52.0"