Bump kotlin from 2.3.20 to 2.3.21 (#318)

dependabot[bot] · web-flow · commit 1f0a4ec569eb · 2026-05-02T07:59:13.000+02:00
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
@@ -1,5 +1,5 @@
 [versions]
-kotlin = "2.3.20" # https://plugins.jetbrains.com/docs/intellij/using-kotlin.html#kotlin-standard-library
+kotlin = "2.3.21" # https://plugins.jetbrains.com/docs/intellij/using-kotlin.html#kotlin-standard-library
 rdGen = "2026.1.3" # https://github.com/JetBrains/rd/releases
 
 [libraries]
