Update kotlin monorepo to v2.2.21 (#786)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 junit = "6.0.0"
 komapper = "5.6.0"
-kotlin = "2.2.20"
+kotlin = "2.2.21"
 ksp = "2.3.0"
 quarkus = "3.29.0"
 spring-boot = "3.5.6"