Bump kotlin from 2.1.20 to 2.1.21 (#45)

dependabot[bot] · web-flow · commit 10d567150619 · 2025-05-14T08:58:17.000+02:00
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
@@ -1,5 +1,5 @@
 [versions]
-kotlin = "2.1.20"
+kotlin = "2.1.21"
 kotest = "6.0.0.M3"
 serialization = "1.8.1"
 graphql = "8.7.0"
