Update dependency org.jetbrains.kotlin.jvm to v2.1.21 (#161)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ logback = "1.5.18"
 # plugins
 changelog = "2.2.1"
 intelliJPlatform = "2.5.0"
-kotlin = "2.1.20"
+kotlin = "2.1.21"
 kover = "0.9.1"
 qodana = "2024.3.4"
 grammarkit = "2022.3.2.2"