Update org.jetbrains.kotlin to v2.3.0 (#304)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 doma = "3.11.1"
-kotlin = "2.2.21"
+kotlin = "2.3.0"
 junit = "5.14.1"
 spotless = "7.2.1"
 doma-codegen = "3.2.1"